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Materials Mechanics Ontology

Release 2024-01-30

This version:
https://w3id.org/pmd/materials-mechanics-ontology/1.0.1
Revision:
1.0.1
Authors:
https://orcid.org/0000-0002-0916-5990
https://orcid.org/0000-0003-0744-8855
Imported Ontologies:
prov-o#
prov-o-inverses#
co
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License:
https://creativecommons.org/licenses/by/4.0/
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Cite as:
https://orcid.org/0000-0002-0916-5990, https://orcid.org/0000-0003-0744-8855. Materials Mechanics Ontology. Revision: 1.0.1. Retrieved from: https://w3id.org/pmd/materials-mechanics-ontology/1.0.1
Provenance of this page
Ontology Specification Draft

Abstract

The materials mechanics ontology is an application-level ontology that was created for supporting named entity recognition tasks for materials fatigue domain. The ontology covers some fairly general MSE concepts that could prospectively be merged into PMDco or other upper materials ontologies such as descriptions of crystallographic defects and microstructural entities. Furthermore, concepts related to the materials fatigue subdomain are also heavily incorporated.

Materials Mechanics Ontology: Overview back to ToC

This ontology has the following classes and properties.

Classes

Object Properties

Annotation Properties

Cross-reference for Materials Mechanics Ontology classes, object properties and data properties back to ToC

This section provides details for each class and property defined by Materials Mechanics Ontology.

Classes

Acoustic dissipationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/AcousticDissipation

synonym acoustic attenuation
has super-classes
Mechanical property c

Agingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Aging

The gradual process of change in the properties of a material owing to structural changes which occur over time under specific conditions.
has super-classes
Mechanism c

Alloyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Alloy

An alloy is an inorganic material with a defined chemical composition consisting primarily of metals but potentially also other chemical elements.
has super-classes
Material c, base material

Alternating strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/AlternatingStrength

According to "FKM-Richtlinie - Rechnerischer Festigkeitsnachweis (2012)" and "Höchstfeste Stähle, IGF-Vorhaben Nr. 19667 BG", the alternating strength is a numerical value that is calculated via the fatigue strength of a material and the mean stress factor. The alternate strength allows the engineer to compare fatigue strengths obtained from tests with different stress ratios (mean stress). It converts the fatigue strength value to an alternate strength value for R=-1. S_WK = fatigue strength / K_AK.
has super-classes
Mechanical property c

Aluminumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Al

Content of element
has super-classes
Chemical element c

Angular rotation-controlledc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/AngularRotationcontrolled

A control type during mechanical testing where the angular rotation of a bending beam is the controlled variable.
has super-classes
Control type c

Annealingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Annealing

Annealing is a heat treatment that alters the physical and sometimes chemical properties of a material to increase ist ductility and reduce ist hardness, making it more workable. It involves heating a material above ist recrystallization temperature, maintaining a suitable temperature for an appropriate amount of time and then cooling.
has super-classes
Heat treatment c

Arsenc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/As

Content of element
has super-classes
Chemical element c

Austenitec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Austenite

The high temperature phase in steels with a face-centered cubic unit cell.
has super-classes
Phase c
has sub-classes
Retained austenite c

Austenite transformation temperature Ac1c back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/AusteniteTransformationTemperatureAc1

The Ac1 austenite transformation temperature depends on the heating rate at marks the temperature at which austenite transformation is initiated.
has super-classes
Microstructural property c

Austenite transformation temperature Ac3c back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/AusteniteTransformationTemperatureAc3

The Ac3 austenite transformation temperature depends on the heating rate at marks the temperature at which austenite transformation is completed.
has super-classes
Microstructural property c

Austenitizingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Austenitizing

Austenitizing means that a steel is heated above the austenitizing temperature (GSE line in the iron carbon diagram). This process changes the lattice structure from a body centered cubic structure (BCC) to a face centered cubic structure (FCC), allowing a martensitic transformation via quenching.
has super-classes
Heat treatment c

Bainitec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Bainite

Bainite is a microstructure formed after quenching at intermediate cooling rates where the ferritic consituents are arranged in a hierarchical manner, additionally carbides, retained austenite, pearlite or martensite-austenite are often present.
has super-classes
Microstructure c

Bend radiusc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/BendRadius

The bend radius refers to the smallest inner radius over which an object can be bent without causing damage.
has super-classes
Mechanical property c

Bending strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/BendingStrength

synonym flexural strength
has super-classes
Mechanical property c

Beryiliumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Be

Content of element
has super-classes
Chemical element c

Body-centered cubicc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/BodycenteredCubic

A cubic Bravais lattice with lattice points at the corners and the center of the cube.
has super-classes
Bravais lattice c

Boriumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/B

Content of element
has super-classes
Chemical element c

Bravais latticec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/BravaisLattice

There are 14 possible Bravais lattices in three dimensional space, which describe the geometric arrangement of the lattice points.
has super-classes
Crystallographic entity c
has sub-classes
Body-centered cubic c, Face-centered cubic c, Hexagonal close packed c

Brinell hardnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/BrinellHardness

A measurement of the hardness of a material as determined by indentation with a steel or tungsten carbide ball.
has super-classes
Mechanical property c

Brittlec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Brittle

Specifies whether the fracture was brittle or ductile
has super-classes
Crack growth behaviour c

Bulkc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Bulk

Refers to the interior of a material.
has super-classes
Location c

Calciumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Ca

Content of element
has super-classes
Chemical element c

Carbidec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Carbide

A chemical compound composed of carbon and a less electronegative element, typically a metal.
has super-classes
Phase c
has sub-classes
Cementite c

Carbonc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/C

Content of element
has super-classes
Chemical element c

Carbon equivalent valuec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CEV

The equivalent carbon content concept it used on ferrous materials, to determine various properties of the alloy when more than just carbon is used as an alloyant. The idea is to convert the percentage of alloying elements other than carbon to the equivalent carbon percentage. CEV = C + Mn/6 + (Cu + Ni)/15 + (Cr + Mo + V)/5
has super-classes
Chemical property c

Carbonitridingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Carbonitriding

A heat treatment process that diffuses carbon and nitrogen into the surface of a material to improve its surface hardness.
has super-classes
Hardening process c, Heat treatment c

Carburizationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Carburization

A heat treatment process that diffuses carbon into the surface of a material to improve its surface hardness.
has super-classes
Hardening process c, Heat treatment c

Case-hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Casehardening

A heat treatment process that hardens the surface of a material while leaving the interior softer.
has super-classes
Hardening process c, Heat treatment c

Cementitec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Cementite

Cementite (Fe3C) is a stochiometric compound (intermetallic) and carbide which contains mainly iron with 6.67 weight-% carbon. It is especially present in carbon-rich steels.
has super-classes
Carbide c

Characterization processc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CharacterizationProcess

A characterization process has the purpose of retrieving information about a specimen.
has super-classes
Process c
has sub-classes
Electron backscatter diffraction measurement c, Image acquisition c, Mechanical test c

Chemicalc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Chemical

A chemical is a substance, typically in liquid phase, that has a defined composition and can undergo a chemical reaction to form new substances, alter properties of an object.
has super-classes
Use case materials mechanics c
has sub-classes
Etchant c

Chemical elementc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ChemicalElement

A symbol or name designator which refers to a chemical element.
has super-classes
Identifier c
has sub-classes
Aluminum c, Arsen c, Beryilium c, Borium c, Calcium c, Carbon c, Chromium c, Cobalt c, Copper c, Hydrogen c, Iron c, Lead c, Magnesium c, Manganese c, Molybdenum c, Nickel c, Niobium c, Nitrogen c, Oxygen c, Phosphorus c, Silicon c, Silver c, Strontium c, Sulfur c, Tin c, Titanium c, Vanadium c, Zinc c, Zirconium c

Chemical propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ChemicalProperty

The behavior of a material in chemical reactions, including its reactivity and flammability.
has super-classes
Material property c
has sub-classes
Carbon equivalent value c, Composition c, Corrosion property c

Chord modulusc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ChordModulus

The slope of an imaginary line (chord) drawn between two specified strain values in a stress-strain curve.
has super-classes
Mechanical property c

Chromiumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Cr

Content of element
has super-classes
Chemical element c

Cobaltc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Co

Content of element
has super-classes
Chemical element c

Coefficient of heat transferc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CoefficientOfHeatTransfer

A numeric value that desribes the extent of heat dissipation through a specific geometry of a specific material
has super-classes
Thermal property c

Cold forgingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ColdForging

A forging process conducted at or near room temperature to shape metal.
has super-classes
Mechanical treatment c

Cold hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ColdHardening

The process of increasing the hardness and strength of a metal by plastic deformation at temperatures below its recrystallization temperature.
has super-classes
Hardening process c, Mechanical treatment c

Componentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Component

A component is a object which fulfills a specific purpose within a system.
has super-classes
Object c

Compositionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Composition

The distribution of chemical elements in materials.
has super-classes
Chemical property c

Compressibilityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Compressibility

The measure of the amount a material or substance reduces in volume under pressure.
has super-classes
Mechanical property c

Compression testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CompressionTest

A mechanical test in which compressive forces are applied to materials.
has super-classes
Mechanical test c

Compressive strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CompressiveStrength

The resistance of a material to breaking under quasistatic compression evaluated from the engineering stress-strain curve before crushing.
has super-classes
Mechanical property c

Compressive yield strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CompressiveYieldStrength

The threshold compression stress after which the a material deforms irreversibly.
has super-classes
Mechanical property c

Control typec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ControlType

The physical variable which is controlled in a mechanical test.
has super-classes
Mechanical test parameter c
has sub-classes
Angular rotation-controlled c, Displacement-controlled c, Load-controlled c, Strain-controlled c

Cooling ratec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CoolingRate

These parameters describe the specimen geometry. They are determined / measured after the machining process is finished and specified before the machining process. The specimen after machining is input for the mechanical testing subprocess.
has super-classes
Heat treatment parameter c

Copperc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Cu

Content of element
has super-classes
Chemical element c

Core hardnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CoreHardness

Value of the hardness, measured along the cross section of the material.
has super-classes
Mechanical property c

Corrosion potentialc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CorrosionPotential

Describes the tendency of a material to release (lose) electrons in the presence of a elecotrolyte. During electrochemical reactions at corrosion potential (E_{corr}), the anodic and cathodic currents are equal in magnitude, and there will not be any net value of current to be measured. The corrosion potential is defined at the potential value where the anodic and cathodic reaction rates meet.
has super-classes
Corrosion property c

Corrosion propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CorrosionProperty

The set of materials properties that describe its resistance to degradation due to chemical reactions with its environment.
has super-classes
Chemical property c
has sub-classes
Corrosion potential c, Corrosion rate c, Critical pitting potential c, Decomposition potential c, Equilibrium potential c, Redox potential c

Corrosion ratec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CorrosionRate

Reduction in wall thickness over time. See "4 - Contribution of iron archaeological artefacts to the estimation of average corrosion rates and the long-term corrosion mechanisms of low-carbon steel buried in soil"
has super-classes
Corrosion property c

Crackc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Crack

Damage type which separates/cleaves a material. Depending of the crack scale, distinct driving forces are at play.
has super-classes
Damage c
has sub-classes
Long crack c, Microstructurally short crack c, Physically short crack c

Crack arrest toughnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackArrestToughness

The standard definition of crack arrest toughness relies on the static estimate KIa (ASTM E1221). Crack arrest toughness K_Ia is considered to represent the minimum fracture toughness of a material. If the fracture mechanical driving force K_I is less than K_Ia, fracture is not possible.
has super-classes
Mechanical property c

Crack extension modec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackExtensionMode

refers to "opening, shearing and tearing" cracks
has super-classes
Mechanical property c

Crack growth behaviourc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackGrowthBehaviour

A specifier which describes the manner in which a crack propagates through a material under stress, e.g. "brittle", "ductile", or "intergranular".
has super-classes
Microstructural property c
has sub-classes
Brittle c, Ductile c

Crack initationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackInitation

The crack initiation stage is reached after the crack nucleation and represents the stage where the crack extended beyond the (persistent) slip band, volume defect, the first microstructural barrier which caused its nucleation. At this stage, the mechanism of crack extension is less dependent on the local stress concentration, vacancy diffusion at slip bands, or phase boundaries but rather resembles modes II/III crack growth (shear-dominated).
has super-classes
Mechanism c

Crack lengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackLength

The instantaneous measurement of the distance between the crack origin and the crack tip.
has super-classes
Microstructural property c

Crack nucleationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackNucleation

The nucleation of a crack in a material under stress caused by the interaction of lattice defects and local decohesion of atomic bonds.
has super-classes
Mechanism c

Crack propagationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackPropagation

The extension of a crack in a material under stress.
has super-classes
Mechanism c

Crack tip opening displacementc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackTipOpeningDisplacement

A measure from fracture mechanics which expresses the distance between opposing faces of the crack at a defined position close to the crack tip during tensile loading and is typically applied for materials which show some degree of plastcity.
has super-classes
Microstructural property c

Crack-induced plasticityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrackinducedPlasticity

The plastic deformation that occurs near the tip of a crack under stress.
has super-classes
Damage c

Creep testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CreepTest

A mechanical test in which a static force is applied causing an elongation and the transition through different creep stages.
has super-classes
Mechanical test c

Critical pitting potentialc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CriticalPittingPotential

Critical pitting potential (E_pit) is the least positive potential at which pits can form. It is the potential at which the metal salt of the aggressive ion in solution is in equilibrium with the metal oxide.
has super-classes
Corrosion property c

Critical value of j integralc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CriticalValueOfJIntegral

The critical value of the J-integral which is a measure of the strain energy release rate above which large-scale plastic yielding during crack propagation is observed.
has super-classes
Mechanical property c

Cross-section geometryc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrosssectionGeometry

Represents the geometry/shape of the cross section
has super-classes
Test specimen property c

Crystal structurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrystalStructure

A crystal structure is defined as the particular repeating geometrical arrangement of atoms (molecules or ions) throughout a crystal
has super-classes
Crystallographic entity c

Crystallographic directionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrystallographicDirection

A characteristic vector in a crystal lattice which can be expressed through its Miller indices.
has super-classes
Crystallographic entity c

Crystallographic entityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrystallographicEntity

A term used to describe any feature associated with the crystal structure of a material.
has super-classes
Microstructure c
has sub-classes
Bravais lattice c, Crystal structure c, Crystallographic direction c, Crystallographic motif c, Crystallographic plane c, Crystallographic texture c, Crystallographic unit-cell c, Slip direction c, Slip direction family c, Slip plane c, Slip plane family c, Slip system c, Slip system family c

Crystallographic motifc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrystallographicMotif

A set of atoms located at crystal lattice points which are periodically repeated throughout the crystal lattice in three dimensions.
has super-classes
Crystallographic entity c

Crystallographic planec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrystallographicPlane

A characteristic plane in a crystal lattice which can be expressed through its Miller indices.
has super-classes
Crystallographic entity c

Crystallographic texturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrystallographicTexture

When a crystallographic orientation is more frequent than others, the material is considered "textured". The crystallographic orientation distribution can be described by an orientation distribution function.
has super-classes
Crystallographic entity c

Crystallographic unit-cell c back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CrystallographicUnitcell

An individual crystallographic unit-cell defined as the smallest unit with the highest symmetry
has super-classes
Crystallographic entity c

Curie temperaturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CurieTemperature

The temperature above which a ferromagnetic or a ferrimagnetic material becomes paramagnetic.
has super-classes
Magnetic property c

Cuttingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Cutting

Cutting is manufacturing by removal of material (DIN 8580
has super-classes
Machining process c

Cycle limitc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CycleLimit

Number of load cycles after which the test is terminated and the specimen is treated as a run out.
has super-classes
Mechanical test parameter c

Cyclicc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Cyclic

Type of loading (tension/compression, rotation bending, bending, shearing, torsion)
has super-classes
Loading type c

Cyclic hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CyclicHardening

A mechanism where over multiple strain-controlled loading cycles a strength increase is observed in a material. The hardening/strengthening is owed to the formation of disclocation structures.
has super-classes
Mechanism c

Cyclic strength coefficientc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CyclicStrengthCoefficient

has super-classes
Mechanical property c

Cyclic yield strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/CyclicYieldStrength

The level of stress at which a material deforms plastically in cyclic loading, equivalent to the yield strength in quasistatic testing.
has super-classes
Mechanical property c

Damagec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Damage

Damage refers to irreversible degradation in a material through the formation of dislocation structures, extrusions, or intrusions or the nucleation of pores or cracks.
has super-classes
Microstructure c
has sub-classes
Crack c, Crack-induced plasticity c, Dislocation structure c, Extrusion c, Fracture surface c, Intrusion c, Lüders band c, Plastic zone c, Protrusion c, Shear band c, Slip band c, Slip lines c, Slip marking c, Striations marks c
is in domain of
initiates at op

Damping capacityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DampingCapacity

A property which quantifies the ability of a material to dissipate elastic strain energy from applied mechanical vibrations or shock impulses.
has super-classes
Mechanical property c

Damping factorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DampingFactor

has super-classes
Mechanical property c

Data setc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DataSet

A dataset is a collection of data that is organized and presented in a structured format, usually in the form of a table, spreadsheet, or database. Datasets can contain various types of data, such as numerical, categorical, or textual data, and can be used for various purposes, such as research, analysis, or machine learning.
has super-classes
Use case materials mechanics c
has sub-classes
Mechanical test data set c

Data transformation processc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DataTransformationProcess

A data transformation process is a process which alters the state of datasets, e.g. image registration.
has super-classes
Process c
has sub-classes
Digital image correlation c

Decomposition potentialc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DecompositionPotential

The minimum voltage needed between an anode and cathode for electrolysis to occur, i.e. an electrolyte to decompose and react.
has super-classes
Corrosion property c

Defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Defect

Defects are imperfections at different scales with different dimensions which affect the continuity and homogeneity of a material.
has super-classes
Microstructure c
has sub-classes
Frank-Read source defect c, Line defect c, Planar defect c, Point defect c, Surface defect c, Volume defect c
is in range of
initiates at op

Deformation twinningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DeformationTwinning

Deformation twinning is a mechanism of plasticity in which twin boundaries form in a material to accomodate a strain. Twinning occurs predominantly in materials which have few slip systems at higher strain rates.
has super-classes
Mechanism c

Descriptorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Descriptor

Descriptors are modifiers which define a thing more precisely.
has super-classes
Use case materials mechanics c, value object
has sub-classes
Location c, Orientation descriptor c, Shape descriptor c, State descriptor c

Detectorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Detector

A device that measures a spatial distribution of electromagnetic radiation and transmits the signal for measurement or analysis.
has super-classes
Sensor c
has sub-classes
Thermography camera c

Diffusion frequency factorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DiffusionFrequencyFactor

A coefficient in the Arrhenius diffusion relation that quantifies the rate at which atoms or particles will diffuse in a given material.
has super-classes
Thermal property c

Digital image correlationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DigitalImageCorrelation

A technique for measuring surface deformation, displacement, and strain by comparing multiple digital images of a material during deformation.
has super-classes
Data transformation process c

Dislocationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Dislocation

A mixed dislocation with arbitrary character.
has super-classes
Line defect c

Dislocation densityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DislocationDensity

A measure of the number of dislocations within a specified area (#/m^2) or dislocation line length within a volume of a material (m/m^3), which can influence its mechanical properties.
has super-classes
Microstructural property c

Dislocation dipolec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DislocationDipole

A dislocation dipole is a low energy configuration of two dislocations by minimizing the lattice distortion around the dislocation lines.
has super-classes
Line defect c

Dislocation structurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DislocationStructure

Dislocation structures are characterized by areas of high dislocation density embedded in, or interspersed with, almost dislocation-free areas.
has super-classes
Damage c

Displacement-controlledc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Displacementcontrolled

A control type during mechanical testing where the displacement at a material is the controlled variable.
has super-classes
Control type c

Dissipated strain energyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DissipatedStrainEnergy

The energy dissipated as internal friction (heat) during the deformation of a material. The area underneath the stress-strain hysteresis loop is a measure of dissipated energy.
has super-classes
Mechanical property c

Ductilec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Ductile

Ductile crack growth refers to crack growth where plasticity is observed in the regions surrounding the crack. It occurs in ductile metals prior to brittle fracture and can typically be analyzed from fracture surfaces.
has super-classes
Crack growth behaviour c

Ductile brittle transition temperaturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DuctileBrittleTransitionTemperature

The temperature below which a material transitions from ductile to brittle behavior.
has super-classes
Mechanical property c

Dwell fatigue testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DwellFatigueTest

A test used to measure a material's or a component's resistance to cyclic load with additionally applied constant high mean stress. This loading state is relevant in the operation of aircrafts in turbine parts.
has super-classes
Fatigue test c

Dynamic fracture toughnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DynamicFractureToughness

A measure of the ability of a material to resist the propagation of a crack under dynamic loading conditions (i.e. abrupt loading) measured as a critical stress intensity factor.
has super-classes
Mechanical property c

Dynamic strain agingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DynamicStrainAging

A phenomenon where the flow stress of a material increases with strain rate due to the interaction of dislocations with solute atoms.
has super-classes
Mechanism c

Dynamic tear energyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DynamicTearEnergy

The dynamic tearing energy value is a measure of a material's fracture resistance under dynamic loading conditions as defined by ASTM E604.
has super-classes
Mechanical property c

Dynamic viscosityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/DynamicViscosity

A measure of resistance to flow under an applied shear force for materials and fluids.
has super-classes
Mass materials property c

Edge dislocationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/EdgeDislocation

A edge dislocation is an idealized one dimensional defect where the dislocation line is oriented orthogonally to the burgers vector. Edge dislocations have different types of movement of which the most common one is the slip/glide on so-called slip systems defined by the crystal structure and materials composition.
has super-classes
Line defect c

Electrical propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ElectricalProperty

The set of materials properties that describe its behavior when subjected to an electric field.
has super-classes
Material property c
has sub-classes
Thermal coefficient of resistivity c

Electron backscatter diffraction measurementc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ElectronBackscatterDiffractionMeasurement

A method used to examine the crystallographic structure and local crystallographic orientations (microtexture) of a material by analyzing the Kikuchi pattern of electrons inelastically scattered back from the surface. The technique is typically conducted in a scanning electron microscope.
has super-classes
Characterization process c

Electropolishingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Electropolishing

An electrochemical process used to reduce the surface roughness of a material. The process is conducted by embedding a workpiece (anode) and tool electrode (cathode) in an electrolyte and appliying an appropriate DC voltage.
has super-classes
Machining process c

Energy release ratec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/EnergyReleaseRate

The amount of energy released per unit area of newly created fracture surface.
has super-classes
Mechanical property c

Engineering strainc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/EngineeringStrain

The engineering strain
has super-classes
Strain c

Engineering strain in loading directionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/EngineeringStrainInLoadingDirection

The engineering strain in loading direction (e.g. In a uniaxial tensile test)
has super-classes
Strain c

Engineering stressc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/EngineeringStress

The engineering stress: Force/originalarea
has super-classes
Stress c

Engineering stress in loading directionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/EngineeringStressInLoadingDirection

The engineering stress component in loading direction (e.g. In a uniaxial tensile test)
has super-classes
Stress c

Environmental test parameterc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/EnvironmentalTestParameter

A variable or condition, such as temperature, humidity, pressure, or gas concentration that is controlled or measured during mechanical testing.
has super-classes
Process parameter c
has sub-classes
Testing medium c

Equilibrium potentialc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/EquilibriumPotential

The potential at which the rates of oxidation and reduction occurring at an electrode are equal.
has super-classes
Corrosion property c

Equipmentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Equipment

Equipment refers to systems or their components which are used in processes.
has super-classes
Object c, processing node
has sub-classes
Image acquisition equipment c, Microscope c, Sensor c, Testing machine c

Etchantc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Etchant

A chemical substance in liquid or gaseous state used in material processing to dissolve, erode, contrast, or otherwise modify the surface of a material.
has super-classes
Chemical c

Etchingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Etching

A process that uses liquid chemicals or gases which react with specific phases or interfaces at the material surface to reveal microstructural constituents.
has super-classes
Machining process c

Extensometerc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Extensometer

Any kind of extensometer, that is used for measuring or controlling displacements
has super-classes
Sensor c

Extrusionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Extrusion

A persistent slip marking which is local and protruding out of the surface
has super-classes
Damage c

Face-centered cubicc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FacecenteredCubic

A cubic Bravais lattice with lattice points at the corners and the faces of the cube. It exhibits the highest packing density.
has super-classes
Bravais lattice c

Failurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Failure

Failure is associated with degradation of the material and typically defined through a failure criterion, for instance a drop in load carrying capacity of the specimen.
has super-classes
Mechanism c

Fatigue crack growth ratec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueCrackGrowthRate

The crack growth rate da/dN expresses the rate at which a crack extends in length per cycle in a material exposed cyclic loading.
has super-classes
Mechanical property c

Fatigue ductility coefficientc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueDuctilityCoefficient

A empirical constant commonly used in low-cycle fatigue models such as the Coffin-Manson relation which represents the strain axis intercept at (2N=1).
has super-classes
Mechanical property c

Fatigue ductility exponentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueDuctilityExponent

A empirical constant commonly used in low-cycle fatigue models such as the Coffin-Manson relation which represents slope of the logarithmic S-N diagram in the low-cycle fatigue regime.
has super-classes
Mechanical property c

Fatigue endurance ratioc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueEnduranceRatio

The ratio of the fatigue endurance limit (sometimes also referred to as fatigue limit) to the tensile strength of a material.
has super-classes
Mechanical property c

Fatigue life mech load cyclesc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueLifeMechLoadCycles

has super-classes
Mechanical property c

Fatigue lifetimec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueLifetime

The cycle count a material can withstand before a specific fatigue criterion is reached due to cyclic load.
has super-classes
Mechanical property c

Fatigue limitc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueLimit

The maximum stress where a material is assumed to withstand an infinite number of load cycles without failure. Also referred to as fatigue endurance limit.
has super-classes
Mechanical property c

Fatigue notch factorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueNotchFactor

A ratio of the un-notched specimen fatigue strength to that of the notched specimen fatigue strength.
has super-classes
Mechanical property c, Test specimen property c

Fatigue notch sensitivityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueNotchSensitivity

The fatigue notch sensistivity is motivated by the phenomenon where the fatigue notch factor is smaller than the stress concentration factor associated with a notch or hole. The fatigue notch sensitivity is defined as stress concentration introduced by the notch at a distance d from the notch root surface equal to the distance between microstructural barriers (e.g. grain boundaries).
has super-classes
Mechanical property c, Test specimen property c

Fatigue strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueStrength

The maximum stress that a material can withstand for a specific number of cycles without breaking.
has super-classes
Mechanical property c

Fatigue strength exponentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueStrengthExponent

An empirically determined material parameter used as an exponent in Basquin's fatigue law to describe the stress-life behavior of a material.
has super-classes
Mechanical property c

Fatigue testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueTest

A fatigue test is a test in which stress amplitudes are cyclically applied onto a material/component to assess its durability to cyclic loads and measure the cycles to failure.
has super-classes
Mechanical test c
has sub-classes
Dwell fatigue test c, High-cycle fatigue test c, Low-cycle fatigue test c, Rolling contact fatigue test c, Very high-cycle fatigue test c

Fatigue test specimenc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FatigueTestSpecimen

Any kind of specimen or test piece used for fatigue testing
has super-classes
Test specimen c
has sub-classes
Run out fatigue specimen c

Ferritec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Ferrite

Alpha iron (ferrite) is the thermodynamically stable low temperature phase (allotrope) and solid solution in iron and steels with a body-centered cubic unit cell. It exhibits a low carbon solubility (0.02 wt% at 727 °C).
has super-classes
Phase c

Finishingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Finishing

Finishing cuts are used to complete the part and achieve the final dimension, tolerances, and surface finish.
has super-classes
Machining process c

Flow stressc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FlowStress

The history-dependent, instantaneous value of stress required to continue deforming a material plastically at a given strain, strain rate, and temperature.
has super-classes
Mechanical property c

Forcec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Force

A force is defined as an influence that causes an object to undergo a change in motion, speed, direction, or shape. It is a vector quantity, which means it has both magnitude and direction. The standard unit of force in the International System of Units (SI) is Newton (N).
has super-classes
Physical quantity c

Forgingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Forging

A manufacturing process where a piece of metal is heated and shaped by compressive forces.
has super-classes
Manufacturing process c

Fracturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Fracture

Fracture refers to the complete separation of an object or material into two or more pieces under the application of an outer load.
has super-classes
Mechanism c

Fracture appearance transition temperaturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FractureAppearanceTransitionTemperature

has super-classes
Mechanical property c

Fracture ductilityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FractureDuctility

has super-classes
Mechanical property c

Fracture stressc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FractureStress

The true stress value at the point of rupture when a material is subjected to a force. For brittle materials, the fracture stress is equivalent to the ultimate tensile strength.
has super-classes
Mechanical property c

Fracture surfacec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FractureSurface

The surface of a material that has been exposed by cracking.
has super-classes
Damage c

Fracture toughnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FractureToughness

A mechanical materials property which measures a material's resistance to crack propagation. The fracture toughness is equivalent to the critical stress intensity factor.
has super-classes
Mechanical property c

Frank-Read sourcec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FrankReadSource

An immobile dislocation pinned at both ends, e.g. at volume defects, emitting more dislocations under loads exceeding a critical local load.
has super-classes
Mechanism c

Frank-Read source defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FrankReadSourceDefect

A defect in a crystal structure acting as a dislocation source upon application of shear loads (Frank-Read mechanism). A Frank-Read defect or source consists of a dislocation pinned at two ends.
has super-classes
Defect c

Frenkel defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FrenkelDefect

FrenkelDefects are defects where a cation leaves its lattice position to form a interstitial defect.
has super-classes
Point defect c

Frequencyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Frequency

Frequency is the number of occurences of a repeating event per unit of time. In this case it means the number of load cycles per second (unit of measurement Hz).
has super-classes
Mechanical test parameter c

Frequency effectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/FrequencyEffect

The relationship between the frequency of an applied cyclic load and the resulting fatigue behavior of a material.
has super-classes
Use case materials mechanics c, entity influence

Geometryc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Geometry

A definition of a shape.
has super-classes
Use case materials mechanics c

Glass transition temperaturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/GlassTransitionTemperature

The temperature at which an amorphous material changes from a brittle, glassy state to a ductile state.
has super-classes
Thermal property c

Goodman diagramc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/GoodmanDiagram

A graphical representation used to illustrate and predict the fatigue strength of materials under varying mean and alternating stresses.
has super-classes
Mechanical test data set c

Grainc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Grain

A grain is defined as a coherent region with nearly uniform orientation distribution. Typically, a disorientation cut-off is defined that separates adjoining grains and facilitates clustering individually sampled volumes.
has super-classes
Microstructure entity c

Grain boundaryc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/GrainBoundary

A grain boundary defines a delimiting boundary between two adjacent monocrstalline regions. The whole warped surface interfacing two grains is considered a grain boundary such that a grain boundary is composed of multiple grain boundary segments or facets.
has super-classes
Planar defect c
has sub-classes
Prior austenite grain boundary c, Tilt boundary c, Twin boundary c, Twist boundary c

Grain boundary hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/GrainBoundaryHardening

The mechanism of strengthening a material by changing its internal grain structure to impede the motion of dislocations.
has super-classes
Mechanism c

Grain boundary networkc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/GrainBoundaryNetwork

A network of grain boundaries that delimit one grain.
has super-classes
Planar defect c

Grain boundary segmentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/GrainBoundarySegment

A grain boundary segment is an approximately coplanar segment/facet of a grain boundary. Each segment can for instance be parametrized by five macroscopic grain boundary parameters. Three parameters specify the misorientations of the adjoining and grain regions and two parameters determine the orientation of the boundary. Furthermore, there are further microscopic parameters.
has super-classes
Planar defect c
has sub-classes
Tilt boundary segment c, Twist boundary segment c

Grain refinementc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/GrainRefinement

The mechanism by which the grain size is reduced through the introduction of particles (e.g. titanium or titanium–boron additions as grain refiners) which act as nucleation sites during recrystallization and grain boundary pinning sites during grain growth.
has super-classes
Mechanism c

Grain sizec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/GrainSize

The dimensions of individual grains in a polycrystalline material expressed as length, area, or volume, often quantified as an average or range.
has super-classes
Microstructural property c

Grindingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Grinding

Grinding is a type of abrasive machining process which uses grinding wheel as cutting tool. Grinding is a subset of cutting, as grinding is a true metal-cutting process.
has super-classes
Machining process c

Hardening processc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HardeningProcess

The class of processes used to increase the hardness and strength of a material, often involving heat treatment or work hardening.
has super-classes
Manufacturing process c
has sub-classes
Carbonitriding c, Carburization c, Case-hardening c, Cold hardening c, Induction hardening c, Shot peening c, Work hardening c

Hardness testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HardnessTest

A mechanical test where an indentation is performed with defined indentation tools and a specific load to measure a specimen's resistance to indentation by optical measurement of the indentation cross-section.
has super-classes
Mechanical test c

Hardness unitc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HardnessUnit

Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical identation. There are different types of units of measurement, such as Brinell (HB), Vickers (HV) or Rockwell (HR) resulting from different testing methods. Hardness values may be compared under certain conditions following DIN EN ISO 18265.
has super-classes
Mechanical property c

Heat capacityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HeatCapacity

A measure of the quantity of heat needed to change the temperature of a substance by one degree.
has super-classes
Thermal property c

Heat treatmentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HeatTreatment

A process where a material is exposed to specific temperature profiles to to alter its physical and mechanical properties.
has super-classes
Manufacturing process c
has sub-classes
Annealing c, Austenitizing c, Carbonitriding c, Carburization c, Case-hardening c, Induction hardening c, Quenching c, Tempering c

Heat treatment durationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HeatTreatmentDuration

The length of time a material is subjected to a specific temperature during heat treatment.
has super-classes
Heat treatment parameter c

Heat treatment parameterc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HeatTreatmentParameter

A variable in the process of heat treatment, such as time, temperature, or cooling rate, that determines the final properties of a material.
has super-classes
Process parameter c
has sub-classes
Cooling rate c, Heat treatment duration c, Heat treatment temperature c, Quenching medium c

Heat treatment temperaturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HeatTreatmentTemperature

The temperature at which a heat treatment process is carried out to change the physical and mechanical properties of a material.
has super-classes
Heat treatment parameter c

Hexagonal close packedc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HexagonalClosePacked

A crystal lattice with highest packing density. It can be constructed by using a hexagonal Bravais lattice but exhibits a two atom motif where the second is positioned at 2/3, 1/3, 1/2.
has super-classes
Bravais lattice c

High-cycle fatiguec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HighcycleFatigue

The HCF regime corresponds to stress amplitudes below macroscopic yielding for which cyclic plastic strain occurs within isolated regions of microstructure concentration (inclusions, favorably oriented grains, etc.). This is the regime of constrained cyclic microplasticity, in that surrounding regions are dominantly elastic.
has super-classes
Mechanism c

High-cycle fatigue testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HighcycleFatigueTest

A fatigue test performed at low cyclic amplitudes corresponding to microplasticity to characterize a materials behaviour of cyclic slip accumulation, formation of slip bands which act as crack initiation sites.
has super-classes
Fatigue test c

Homogenizationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Homogenization

A heat treatment process used to reach an equilibirium state, i.e. attain uniformal elemental distribution and avoid microsegregation, through diffusion. The process is performed below the solidus temperature for an extended period of time.
has super-classes
Manufacturing process c

Hot forgingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/HotForging

A forging process conducted at a temperature that is high enough to avoid strain hardening.
has super-classes
Thermomechanical treatment c

Hydrogenc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/H

Content of element
has super-classes
Chemical element c

Identifierc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Identifier

An identifier is a string which distinguishes instances of objects, processes, datasets, materials.
has super-classes
Use case materials mechanics c
has sub-classes
Chemical element c, Material c, Material class c

Image acquisitionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ImageAcquisition

The process of capturing an image by a camera sensor and storing it a digital entity.
has super-classes
Characterization process c
has sub-classes
Light optical microscopy measurement c, Scanning electron microscopy measurement c, Thermography measurement c, Transmission electron microscopy measurement c

Image acquisition equipmentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ImageAcquisitionEquipment

An optical system which acquires images.
has super-classes
Equipment c

Impact toughnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ImpactToughness

The amount of energy which a material is able to absorb before rupture when subjected to an impact load. Different testing setups and protocols exist to measure this quantity.
has super-classes
Mechanical property c

Inclusionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Inclusion

Inclusions are phases with distinct chemical composition and/or crystal structure from the bulk (i.e. grains) with dimensions larger than 100 nm
has super-classes
Volume defect c

Inclusion compositionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/InclusionComposition

{1..N} Elements the inclusion consists of.
has super-classes
Microstructural property c

Inclusion sizec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/InclusionSize

A measure of the size of impurities (e.g. manganese-sulphide particles) in a material expressed as length, area, or volume.
has super-classes
Microstructural property c

Induction hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/InductionHardening

A heat treatment process that increases the surface hardness of a material using electromagnetic induction to heat the material, followed by quenching.
has super-classes
Hardening process c, Heat treatment c

Intermetallicc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Intermetallic

A type of metallic compound, typically ordered, that is composed of two or more metallic elements. Intermetallic compounds exhibit crystal structures which deviate from the ones of the contained metals and ionic or covalent bonding forces can act as well aside from the metallic bond.
has super-classes
Phase c

Interstitial atomc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/InterstitialAtom

An additional atom at a position not part of the regular lattice but rather in free sites inside the unit cell.
has super-classes
Point defect c

Intrusionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Intrusion

A persistent slip marking which is local and resembles a notch is the surface. Typically, intrusions form where the transilition from a slip band to the matrix meets the surface.
has super-classes
Damage c

Ironc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Fe

Content of element
has super-classes
Chemical element c

Isotropic hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/IsotropicHardening

A model of plastic deformation that assumes an equal change in yield stress in all directions, i.e. the yield surface expands uniformly in the radial direction.
has super-classes
Mechanism c

Kinematic hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/KinematicHardening

A hardening mechanism described by plasticity theory, where the yield surface is shifted depending on the load history.
has super-classes
Mechanism c

Kinematic viscosityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/KinematicViscosity

A measure of a fluid's internal resistance to flow under gravity.
has super-classes
Mass materials property c

Knee pointc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/KneePoint

Depending on the type of the SN-curve model, one or several knee points exist, where the SN curve changes its slope. For ferritic steels, there is usually a constant, non-zero slope of the SN-curve in the high cycle fatigue regime (e.g. 10^4 < n < 10^6), followed by a horizontal shape of the SN curve after reaching the fatigue strength / endurance limit. In this case the knee point corresponds to the endurance limit. For other materials (e.g. aluminium or austenitic steels), a horizontal slope is never reached, but there are at least two regions with different slope, which are separated by the knee point (in terms of cycles).
has super-classes
Mechanical property c

Knoop hardnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/KnoopHardness

A measure of hardness measuring the resistance of a material to indendation. Knoop microhardness testing is particularly applied for very brittle materials or thin sheets, where only a small indentation may be made for testing. The indenter tip is a diamond-shaped pyramid.
has super-classes
Mechanical property c

Laser cuttingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LaserCutting

A non-contact, thermal-based fabrication process for cutting materials.
has super-classes
Machining process c

Latent heat of evaporationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LatentHeatOfEvaporation

The amount of energy required to convert a unit mass of a material from liquid to gas at constant temperature and pressure.
has super-classes
Thermal property c

Lattice parameterc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LatticeParameter

A charactersitic length or angle within a unit cell of a specific crystal lattice system, defined by the Bravais lattices. The length typically define the spacing between atoms which are repeated periodically along specific crystallographic directions.
has super-classes
Microstructural property c

Leadc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Pb

Content of element
has super-classes
Chemical element c

Ledeburite Ic back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LedeburiteI

An eutectic microstructure of steel at elevated temperature composed of austenite and cementite
has super-classes
Microstructure c

Ledeburite IIc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LedeburiteII

An eutectic microstructure of steel at elevated temperature composed of pearlite and cementite. Instead of pearlite, also bainite or martensite can be present when cooled faster.
has super-classes
Microstructure c

Light optical microscopec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LightOpticalMicroscope

A tool that uses visible light and magnifying lenses to examine small objects not visible to the naked eye.
has super-classes
Microscope c

Light optical microscopy measurementc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LightOpticalMicroscopyMeasurement

The use of a light microscope to examine the microstructure and other features of a material.
has super-classes
Image acquisition c

Line defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LineDefect

Lines along which whole rows of atoms in a solid are arranged anomalously
has super-classes
Defect c
has sub-classes
Dislocation c, Dislocation dipole c, Edge dislocation c, Quadruple junction c, Screw dislocation c, Triple junction c

Linear expansion coefficientc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LinearExpansionCoefficient

The fractional change in size of a material for a given increase in temperature.
has super-classes
Mechanical property c

Liquidus temperaturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LiquidusTemperature

The temperature above which a material is fully liquid.
has super-classes
Thermal property c

Load cellc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LoadCell

Any kind of load cell to measure forces
has super-classes
Sensor c

Load-controlledc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Loadcontrolled

A control type during mechanical testing where the force in a material is the controlled variable.
has super-classes
Control type c

Loading typec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LoadingType

Describes the way in which a load is applied to a material or specimen.
has super-classes
Mechanical test parameter c
has sub-classes
Cyclic c, Monotonous c, Sinusoidal c, Triangular c

Locationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Location

A location is a descriptor which specifies the position, i.e., the coordinates of another thing. Examples are "Welding seam" or "Hardened zone".
has super-classes
Descriptor c
has sub-classes
Bulk c, Notch c, Surface c

Long crackc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LongCrack

A type of fracture in a material that extends over a significant distance, often leading to structural failure.
has super-classes
Crack c

Low-cycle fatiguec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LowcycleFatigue

LCF conditions occur at higher applied stress amplitudes for which the cyclic plasticity becomes widespread and more homogeneously distributed. From a mechanics perspective, LCF can be regarded as an homogenization problem involving multisite cracking and coalescence. Variability of behavior in LCF is less pronounced for a givenmicrostructure and arises chiefly in relation to crack growth phenomena.
has super-classes
Mechanism c

Low-cycle fatigue testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LowcycleFatigueTest

A fatigue test performed at high and medium cyclic amplitudes corresponding to macroscopic plasticity to characterize a materials LCF behaviour.
has super-classes
Fatigue test c

Lüders bandc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/LüdersBand

Strain localization phenomenon which results in band-shaped strain distribution and occurs during tensile deformation of many materials. The underlying mechanism is associated with dynamic strain aging, i.e. interstitial atoms, such as carbon in steels, which can inhibit dislocation motion.
has super-classes
Damage c

Machining processc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MachiningProcess

A process in which a piece of raw material is abrasively processed into a desired final shape and size by a controlled material-removal process such as milling or turning.
has super-classes
Manufacturing process c
has sub-classes
Cutting c, Electropolishing c, Etching c, Finishing c, Grinding c, Laser cutting c, Milling c, Polishing c, Roughing c, Turning c, Waterjet cutting c, Wire discharge machining c

Macroscopic grain boundary parameterc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MacroscopicGrainBoundaryParameter

A group of parameters that describe the structure of a grain boundary on a macroscopic level, specifically the misorientation across a grain boundary with three parameters (Rodrigues vector) and the orientation of the grain boundary plane normal with two parameters amounting to five parameters.
has super-classes
Microstructural property c

Magnesiumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Mg

Content of element
has super-classes
Chemical element c

Magnetic propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MagneticProperty

The set of materials properties that describe its interactions with a magnetic field.
has super-classes
Material property c
has sub-classes
Curie temperature c

Manganesec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Mn

Content of element
has super-classes
Chemical element c

Manufacturing processc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ManufacturingProcess

A manufacturing process is a process that aims to transform raw materials, components, or subassemblies into finished products that meet specific quality, cost, and performance requirements by altering their state, e.g. shape, microstructure.
has super-classes
Process c
has sub-classes
Forging c, Hardening process c, Heat treatment c, Homogenization c, Machining process c, Mechanical treatment c, Metallurgy process c, Thermomechanical treatment c

Martensitec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Martensite

Martensite is a microstructure formed after quenching at fast cooling rates where the ferritic consituents are arranged in a hierarchical manner, additionally carbides and retained austenite are often present.
has super-classes
Microstructure c

Martensite-Austenite islandc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MartensiteAusteniteIsland

Martensite-austenite islands are entities, typically smaller clusters with different morphology, composed of martensite and retained austenite.
has super-classes
Microstructure entity c

Mass densityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MassDensity

The mass per unit volume of a material.
has super-classes
Mass materials property c

Mass materials propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MassMaterialsProperty

The set of materials properties related to the mass or density of the material.
has super-classes
Material property c
has sub-classes
Dynamic viscosity c, Kinematic viscosity c, Mass density c, Specific weight c

Materialc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Material

Material refers to a designator for matter with an unambiguously defined chemical composition, e.g. EN1.4003", "100Cr6", or "PMMA".
has super-classes
Identifier c
has sub-classes
Alloy c

Material classc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MaterialClass

A material class is a designator for any set of materials where the chemical composition is ambiguously defined, e.g. things such as "polymers", "bainitic steel", and "highly chromium alloyed stainless steel".
has super-classes
Identifier c

Material propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MaterialProperty

A material property is a characteristic of the material which emerges from its inner structure rather than its dimensions.
has super-classes
Property c
has sub-classes
Chemical property c, Electrical property c, Magnetic property c, Mass materials property c, Mechanical property c, Microstructural property c, Thermal property c

Maximum stressc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MaximumStress

The maximum stress S_max is the highest occuring stress during fatigue testing.
has super-classes
Mechanical test parameter c

Mean stressc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MeanStress

The mean stress S_m is the averaged value of the stresses during fatigue testing (S_m = (S_min + S_max)/2).
has super-classes
Mechanical test parameter c

Mean stress factorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MeanStressFactor

The mean stress factor is a numerical value calculated by the mean stress sensitivity and the stress ratio. The formula is depending on the stress ratio value. The mean stress factor indicates the influence of mean stress on the fatigue strength of a material (see "FKM-Richtlinie - Rechnerischer Festigkeitsnachweis (2012)" and "Höchstfeste Stähle, IGF-Vorhaben Nr. 19667 BG") K_AK = f(M_sig, R)
has super-classes
Mechanical property c

Mean stress sensitivityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MeanStressSensitivity

The mean stress sensitivity is a numerical value that indicates how sensible a steel is reacting to mean stress influence. It is calculated via the parameters/constants a_M and b_M (which are specified further in "FKM-Richtlinie - Rechnerischer Festigkeitsnachweis (2012)" and "Höchstfeste Stähle, IGF-Vorhaben Nr. 19667 BG") and the tensile strength of the material. M_sig = f(Rm, a_M, b_M)
has super-classes
Mechanical property c

Mechanical propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MechanicalProperty

Characteristics of a material that define its response to an applied load.
has super-classes
Material property c
has sub-classes
Acoustic dissipation c, Alternating strength c, Bend radius c, Bending strength c, Brinell hardness c, Chord modulus c, Compressibility c, Compressive strength c, Compressive yield strength c, Core hardness c, Crack arrest toughness c, Crack extension mode c, Critical value of j integral c, Cyclic strength coefficient c, Cyclic yield strength c, Damping capacity c, Damping factor c, Dissipated strain energy c, Ductile brittle transition temperature c, Dynamic fracture toughness c, Dynamic tear energy c, Energy release rate c, Fatigue crack growth rate c, Fatigue ductility coefficient c, Fatigue ductility exponent c, Fatigue endurance ratio c, Fatigue life mech load cycles c, Fatigue lifetime c, Fatigue limit c, Fatigue notch factor c, Fatigue notch sensitivity c, Fatigue strength c, Fatigue strength exponent c, Flow stress c, Fracture appearance transition temperature c, Fracture ductility c, Fracture stress c, Fracture toughness c, Hardness unit c, Impact toughness c, Knee point c, Knoop hardness c, Linear expansion coefficient c, Mean stress factor c, Mean stress sensitivity c, Modulus of compression c, Modulus of elasticity c, Nil ductility transition temperature c, Notch rupture strength c, Notch tensile strength c, Percent elongation at failure c, Percent reduction of area at failure c, Plane strain fracture toughness c, Plastic strain ratio c, Poisson number c, Ramberg-Osgood cyclic hardening exponent c, Residual stress c, Rockwell hardness c, Rupture life c, Scleroscope hardness c, Secant modulus c, Secondary creep c, Shear modulus c, Shear yield strength c, Specific strength c, Strain hardening exponent c, Strength coefficient c, Stress corrosion cracking crack growth rate c, Stress intensity range c, Surface hardness c, Tangent modulus c, Tensile strain to failure c, Tensile ultimate strength c, Tensile yield strength c, Torsional strength c, Ultimate shear strength c, Vickers hardness c, Wave propagation velocity c, Yield point c, Yield strain c

Mechanical testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MechanicalTest

A set of methods used to measure the mechanical properties of materials, such as strength, ductility, and hardness.
has super-classes
Characterization process c
has sub-classes
Compression test c, Creep test c, Fatigue test c, Hardness test c, Uniaxial tensile test c

Mechanical test data setc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MechanicalTestDataSet

A collection of data obtained from mechanical testing of a material.
has super-classes
Data set c
has sub-classes
Goodman diagram c, SN curve c, Strain life curve c

Mechanical test parameterc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MechanicalTestParameter

A variable in a mechanical test that can be controlled.
has super-classes
Process parameter c
has sub-classes
Control type c, Cycle limit c, Frequency c, Loading type c, Maximum stress c, Mean stress c, Minimum stress c, R ratio c, Strain amplitude c, Strain rate c, Strain ratio c, Stress amplitude c, Stress range c

Mechanical treatmentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MechanicalTreatment

A process that alters the physical properties of a material by applying forces that induce mechanical deformation.
has super-classes
Manufacturing process c
has sub-classes
Cold forging c, Cold hardening c, Shot peening c, Work hardening c

Mechanismc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Mechanism

A mechanism describes causation e.g. a specific phenomenon, event, or property which affects other things
has super-classes
Use case materials mechanics c, activity
has sub-classes
Aging c, Crack initation c, Crack nucleation c, Crack propagation c, Cyclic hardening c, Deformation twinning c, Dynamic strain aging c, Failure c, Fracture c, Frank-Read source c, Grain boundary hardening c, Grain refinement c, High-cycle fatigue c, Isotropic hardening c, Kinematic hardening c, Low-cycle fatigue c, Necking c, Pitting corrosion c, Precipitation hardening c, Solid solution strengthening c, Strain hardening c, Very high-cycle fatigue c

Melting pointc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MeltingPoint

The temperature at which a chemically pure material consisting of single element transitions from a solid to a liquid state.
has super-classes
Thermal property c

Melting rangec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MeltingRange

The temperature interval over which a pure material/substance transitions from a solid to a liquid state under a standard pressure.
has super-classes
Thermal property c

Metallurgy processc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MetallurgyProcess

Processes used in the production and treatment of metals and alloys.
has super-classes
Manufacturing process c

Microscopec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Microscope

An instrument which uses optics to magnify and study objects that are otherwise too small for the naked eye.
has super-classes
Equipment c
has sub-classes
Light optical microscope c, Scanning electron microscope c, Transmission electron microscope c

Microstructural propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MicrostructuralProperty

The set of materials properties which describes the internal structure on the microscopic level.
has super-classes
Material property c
has sub-classes
Austenite transformation temperature Ac1 c, Austenite transformation temperature Ac3 c, Crack growth behaviour c, Crack length c, Crack tip opening displacement c, Dislocation density c, Grain size c, Inclusion composition c, Inclusion size c, Lattice parameter c, Macroscopic grain boundary parameter c, Miller indices direction c, Miller indices plane c, Precipitate composition c, Precipitate size c, Precipitate spacing c, Slip irreversibility c

Microstructurally short crackc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MicrostructurallyShortCrack

A crack in a material that is confined to a few grains and is propagating on crystallographic planes/grain boundaries.
has super-classes
Crack c

Microstructurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Microstructure

Microstructure refers to the inner distribution of chemical elements, phases, defects, and crystallographic orientations within a material and describes the state of a material.
has super-classes
Use case materials mechanics c, entity
has sub-classes
Bainite c, Crystallographic entity c, Damage c, Defect c, Ledeburite I c, Ledeburite II c, Martensite c, Microstructure entity c, Pearlite c, Phase c

Microstructure entityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MicrostructureEntity

Entities at the microscale, which consititute the material such as grains other structural components.
has super-classes
Microstructure c
has sub-classes
Grain c, Martensite-Austenite island c

Miller indices directionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MillerIndicesDirection

Miller indices are a notation system in crystallography which can be used to express a direction, i.e. through square brackets for individual directions or angled brackets for families of crystallographically-equivalent directions.
has super-classes
Microstructural property c

Miller indices planec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MillerIndicesPlane

Miller indices are a notation system in crystallography which can be used to express a plane orientation, i.e. through round brackets for individual planes or curly brackets for families of crystallographically-equivalent planes.
has super-classes
Microstructural property c

Millingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Milling

Milling is the process of machining using rotary cutters to remove material by advancing a cutter into a workpiece. This may be done varying direction on one or several axes, cutter head speed, and pressure.
has super-classes
Machining process c

Minimum stressc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/MinimumStress

The minimum stress S_min is the lowest occuring stress during fatigue testing.
has super-classes
Mechanical test parameter c

Modelc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Model

A model is a mathematical formulation which attempts to describe the behaviour of real things, e.g. analytical, statistical, probabilistic, ab initio, finite element.
has super-classes
Use case materials mechanics c

Modulus of compressionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ModulusOfCompression

The ratio of compressive stress to strain in the linear elastic region of a material.
has super-classes
Mechanical property c

Modulus of elasticityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ModulusOfElasticity

The ratio of tensile stress to tensile strain (slope) in the elastic deformation regime.
has super-classes
Mechanical property c

Molybdenumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Mo

Content of element
has super-classes
Chemical element c

Monotonousc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Monotonous

A monotonous loading refers to an applied load that is steadily increasing.
has super-classes
Loading type c

Neckingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Necking

The localized reduction in cross-sectional area that a material undergoes in the plastic regime before fracture when subjected to tensile stress.
has super-classes
Mechanism c

Nickelc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Ni

Content of element
has super-classes
Chemical element c

Nil ductility transition temperaturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/NilDuctilityTransitionTemperature

The temperature below which a material loses its ability to deform plastically and instead exhibits brittle fractures when subjected to stress. The Nil-Ductility-Transisition-Temperature is defined as the temperature at which the yield and tensile strength coincide.
has super-classes
Mechanical property c

Niobiumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Nb

Content of element
has super-classes
Chemical element c

Nitrogenc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/N

Content of element
has super-classes
Chemical element c

Nominal strain amplitudec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/NominalStrainAmplitude

A test parameter which which expresses the macroscopic target strain amplitude for a strain-controlled fatigue test.
has super-classes
Strain amplitude c

Nominal stress amplitudec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/NominalStressAmplitude

A test parameter which which expresses the macroscopic target stress amplitude for a force-controlled fatigue test.
has super-classes
Stress amplitude c

Notchc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Notch

A recess in an object which is typically approximately V-shaped.
has super-classes
Location c

Notch diameterc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/NotchDiameter

diameter in the notch base in mm
has super-classes
Test specimen property c

Notch radiusc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/NotchRadius

notch radius in mm
has super-classes
Test specimen property c

Notch rupture strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/NotchRuptureStrength

The maximum stress that a notched specimen can withstand before failure.
has super-classes
Mechanical property c

Notch tensile strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/NotchTensileStrength

The tensile strength of a notched specimen of material.
has super-classes
Mechanical property c

Objectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Object

An object is a tangible thing.
has super-classes
Use case materials mechanics c
has sub-classes
Component c, Equipment c, Sample c, Semi finished product c

Orientation descriptorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/OrientationDescriptor

An orientation descriptor is an entity that describes the orientation of things.
has super-classes
Descriptor c

Oxygenc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/O

Content of element
has super-classes
Chemical element c

Pearlitec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Pearlite

Pearlite is a lamellar microsture with alternating carbon-depleted alpha iron and cementite which occurs in steels with higher carbon content.
has super-classes
Microstructure c

Percent elongation at failurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PercentElongationAtFailure

A measure of ductility expressed as the increase in the length of a material sample at the point of rupture relatively to its original length (percentage).
has super-classes
Mechanical property c

Percent reduction of area at failurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PercentReductionOfAreaAtFailure

The percentage decrease in the cross-sectional area of a material from its original size to its final size at failure measured from a quasistatic tensile test.
has super-classes
Mechanical property c

Persistent slip bandc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PersistentSlipBand

Persistent slip bands are localized bands of plastic deformation with a complex dislocation substructure that formed during cyclic loading and are typically accompanied by slip markings on the surface. The designation "persistent" is owed to the fact that after surface polishing, the slip band is still present and causes surface slip markings.
has super-classes
Slip band c

Phasec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Phase

A phase describes the crystal structure and the specific chemical compound. A specific compound can exist in different crystal structures as defined by polymorphism. In multi-phase materials, multiple distinct phases can form in distinct regions.
has super-classes
Microstructure c
has sub-classes
Austenite c, Carbide c, Ferrite c, Intermetallic c, Solid solution c

Phosphorusc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/P

Content of element
has super-classes
Chemical element c

Physical quantityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PhysicalQuantity

A physical quantity is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a value that is composed of a numerical value and optionally a measurement unit.
has super-classes
Use case materials mechanics c, value object
has sub-classes
Force c, Pressure c, Strain c, Stress c, Temperature c

Physically short crackc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PhysicallyShortCrack

A crack in a material with a length substantially larger than the microstructural dimensions to which the small scale yielding assumption applies but Paris' law does not. Crack growth rates are increased as opposed to microstructurally short cracks due to reduced crack closure.
has super-classes
Crack c

Pitting corrosionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PittingCorrosion

A localized form of corrosion that leads to the creation of small holes, or pits, in the material caused by local depassivation (breakdown of the passivating film).
has super-classes
Mechanism c

Planar defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PlanarDefect

A two-dimensional defect in the crystal structure of a material, such as a grain boundary or stacking fault.
has super-classes
Defect c
has sub-classes
Grain boundary c, Grain boundary network c, Grain boundary segment c, Stacking fault c

Plane strain fracture toughnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PlaneStrainFractureToughness

The measure of a material's resistance to fracture in a plane of strain.
has super-classes
Mechanical property c

Plastic strain ratioc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PlasticStrainRatio

A measure of the resistance of sheet metal to thinning or thickening deformation when subjected to tensile or compressive strain. A high plastic strain ratio implies easily in-plane which is typically desirable to avoid stress concentrations.
has super-classes
Mechanical property c

Plastic zonec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PlasticZone

The region near the tip of a crack where plastic deformation occurs in a material.
has super-classes
Damage c

Point defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PointDefect

Local anomalies at the atomic scale which do not exhibit a higher dimensional lattice structure
has super-classes
Defect c
has sub-classes
Frenkel defect c, Interstitial atom c, Schottky defect c, Substitional atom c, Vacancy c

Poisson numberc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PoissonNumber

A measure of the deformation behavior of a material in response to a uniaxial stress, specifically the negative ratio of lateral strain to axial strain.
has super-classes
Mechanical property c

Polishingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Polishing

Polishing and buffing are finishing processes for smoothing a workpiece's surface. While used less extensively than traditional mechanical polishing, electropolishing is an alternative form of polishing that uses the principles of electrochemistry to remove microscopic layers of metal from a base surface.
has super-classes
Machining process c

Porec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Pore

A pore defect is a void in which atoms are absent. Pores can form during manufacturing, by decohesion of inclusions, as a response to loading.
has super-classes
Volume defect c

Precipitatec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Precipitate

Precipitates are locally dispersed phases with distinct chemical composition and/or crystal structure from the bulk (i.e. grains) with dimensions typically between 1-100 nm
has super-classes
Volume defect c

Precipitate compositionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PrecipitateComposition

{1..N} Elements the precipitates consists of.
has super-classes
Microstructural property c

Precipitate sizec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PrecipitateSize

A dimension of precipitates expressed as length, area, or volume. Precipitates are particles embedded in a matrix that form in some alloys due to changes in solubility when the temperature is altered.
has super-classes
Microstructural property c

Precipitate spacingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PrecipitateSpacing

The distance between precipitates in a material.
has super-classes
Microstructural property c

Precipitation hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PrecipitationHardening

A mechanism in which the yield strength of alloys is increased by the formation of finely-dispersed secondary phase particles on the nanoscale.
has super-classes
Mechanism c

Pressurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Pressure

Pressure is defined as the force per unit area that is exerted by a fluid (liquid or gas) on the walls of its container or on an immersed object. It is a scalar quantity, which means it has only magnitude and no direction. The standard unit of pressure in the International System of Units (SI) is Pascal (Pa).
has super-classes
Physical quantity c

Prior austenite grain boundaryc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/PriorAusteniteGrainBoundary

A grain boundary of a former austenite grain that was partioned into (strained) ferritic subgrains which are hierarchically structured.
has super-classes
Grain boundary c

Processc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Process

A process can be defined as a series of steps or actions that are taken to achieve a particular goal or outcome. In science, engineering, and technology, a process is a systematic procedure that is used to produce a desired result or product.
has super-classes
Use case materials mechanics c
has sub-classes
Characterization process c, Data transformation process c, Manufacturing process c, Simulation process c

Process parameterc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ProcessParameter

Process parameters are properties of a specific process, e.g., a displacement speed during a characterization process.
has super-classes
Property c
has sub-classes
Environmental test parameter c, Heat treatment parameter c, Mechanical test parameter c

Propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Property

Properties are characteristic values of things.
has super-classes
Use case materials mechanics c, value object
has sub-classes
Material property c, Process parameter c, Test specimen property c

Protrusionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Protrusion

A macroscopic persistent slip marking which is spatially extensive and protruding out of the surface
has super-classes
Damage c

Quadruple junctionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/QuadrupleJunctionLine

A point at which four adjacent grains meet.
has super-classes
Line defect c

Quenchingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Quenching

Quenching after austenitizing is necessary to suppress the normal breakdown of austenite into ferrite and cementite, and to cause a partial decomposition at such a low temperature to produce martensite. To obtain this, steel requires a critical cooling velocity, which is greatly reduced by the presence of alloying elements, which therefore cause hardening with mild quenching (e.g. oil and hardening steels).
has super-classes
Heat treatment c

Quenching mediumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/QuenchingMedium

These parameters describe the specimen geometry. They are determined / measured after the machining process is finished and specified before the machining process. The specimen after machining is input for the mechanical testing subprocess.
has super-classes
Heat treatment parameter c, medium

R ratioc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StressRatio

Relation of S_min to S_max (R = S_min / S_max). 0 < R < 1 describes tension-tension loading, R = 0 describes pulsating stress (S_m = S_a = S_max), -1 < R < 0 describes partly reversed tension-compression loading, R = -1 describes fully reversed loading, -"infinte" < R < -1 describes partly reversed compression loading, R = -"infinite" is compression pulsating stress, R > 1 describes compression-compression loading
has super-classes
Mechanical test parameter c

Ramberg-Osgood cyclic hardening exponentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/RambergOsgoodCyclicHardeningExponent

Hardening exponent determined by fitting the Ramber-Osgood equation to fatigue hyteresis. Add Equation
has super-classes
Mechanical property c

Redox potentialc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/RedoxPotential

A measure of the tendency of a chemical species to acquire or lose electrons from/to an electrode and thereby be reduced. The redox potential is expressed in Volts and defined relative to a reference electrode.
has super-classes
Corrosion property c

Residual stressc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ResidualStress

The stress remaining in a material after the original cause of the stress, e.g. a thermal or mechanical treatment, has been removed.
has super-classes
Mechanical property c

Retained austenitec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/RetainedAustenite

Retained austenite is the austenite which is retained at low temperatures as a consequence of abrupt cooling.
has super-classes
Austenite c

Rockwell hardnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/RockwellHardness

A measure used to determine the hardness of a material by measuring the depth of penetration of an hard metal indenter under a large load compared to a penetration made by a preload.
has super-classes
Mechanical property c

Rolling contact fatigue testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/RollingContactFatigueTest

Rolling contact fatigue (RCF) is defined as the process of fatigue due to rolling/sliding contact.
has super-classes
Fatigue test c

Roughingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Roughing

Roughing cuts are used to remove large amount of material from the starting workpart as rapidly as possible, i.e. with a large Material Removal Rate (MRR), in order to produce a shape close to the desired form, but leaving some material on the piece for a subsequent finishing operation.
has super-classes
Machining process c

Run out fatigue specimenc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/RunOutFatigueSpecimen

Has the specimen been a run out? A run out is a specimen that survives a certain amount of cycles (cycle limit e. g. 10^7) without failure.
has super-classes
Fatigue test specimen c

Rupture lifec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/RuptureLife

The time taken for a material to fail under creep loading at a specified constant load and temperature.
has super-classes
Mechanical property c

Samplec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Sample

A specimen is a part of a object which is supposed to be characterized.
has super-classes
Object c
has sub-classes
Test specimen c

Scale effectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ScaleEffect

The influence of sample/component size on the properties which is not associated with a change of underlying mechanism/physical law but rather with changes in the surface-to-volume ratio.
has super-classes
Use case materials mechanics c, entity influence

Scanning electron microscopec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ScanningElectronMicroscope

An instrument that uses focused beams of electrons to obtain information about the surface topography and composition of a sample.
has super-classes
Microscope c

Scanning electron microscopy measurementc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ScanningElectronMicroscopyMeasurement

A electron microscopy technique where sample surface is imaged by scanning it with a high-energy beam of electrons a capturing electrons on different detectors.
has super-classes
Image acquisition c

Schottky defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SchottkyDefect

A type of (quasi) point defect in a crystal lattice where nearby anion and cation sites are unoccupied (two vacancies). The anion and cation vacancies maintain a stochiometric ratio to preserve charge neutrality.
has super-classes
Point defect c

Scleroscope hardnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ScleroscopeHardness

A measure of the hardness of a material determined by the rebound height of a steel ball dropped from a fixed height onto the material.
has super-classes
Mechanical property c

Screw dislocationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ScrewDislocation

A screw dislocation is an idealized one dimensional defect where the dislocation line is oriented parallel to the Burgers vector. Screw dislocations have different types of movement of which the most common one is the cross slip on so-called slip systems defined by the crystal structure and materials composition.
has super-classes
Line defect c

Secant modulusc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SecantModulus

The slope of the stress-strain curve measured from the origin to a specific point, representing the material's elasticity under specific strain.
has super-classes
Mechanical property c

Secondary creepc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SecondaryCreep

The secondary stage in the creep deformation process where the strain rate is almost constant.
has super-classes
Mechanical property c

Segregationc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Segregation

Segregation is the enrichment of atoms of a specific kind (element) at a microscopic region in a materials system.
has super-classes
Volume defect c

Semi finished productc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SemiFinishedProduct

A semi-finished product is a raw material which is further processed to obtain a component.
has super-classes
Object c

Sensorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Sensor

A device that measures a physical stimulus and transmits the signal for measurement or analysis.
has super-classes
Equipment c
has sub-classes
Detector c, Extensometer c, Load cell c, Thermocouple c

Shape descriptorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ShapeDescriptor

A shape descriptor is an entity that describes the shape of things, for instance "sheet", "cuboidal", "cylindrical", and "hourglass".
has super-classes
Descriptor c

Shear bandc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ShearBand

A localized zone of intense shearing strain in a material, often associated with the onset of failure.
has super-classes
Damage c

Shear modulusc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ModulusOfRigidity

Also known as shear modulus, it is a measure of a material's resistance to shear deformation which is measured in Pascal (Pa).
has super-classes
Mechanical property c

Shear yield strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ShearYieldStrength

The maximum shear stress that a material can withstand without undergoing permanent plastic deformation.
has super-classes
Mechanical property c

Shot peeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ShotPeening

A process used to produce a surface layer of compressive stresses in a component by bombarding it with small spherical media.
has super-classes
Hardening process c, Mechanical treatment c

Siliconc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Si

Content of element
has super-classes
Chemical element c

Silverc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Ag

Content of element
has super-classes
Chemical element c

Simulation processc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SimulationProcess

A simulation process is a process which uses a model to predict the behaviour of something.
has super-classes
Process c

Sinusoidalc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Sinusoidal

Type of loading (tension/compression, rotation bending, bending, shearing, torsion)
has super-classes
Loading type c

Size effectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SizeEffect

An abrupt change of properties caused by changes in sample/component size where the underlying mechanism/physical law changes (e.g. surface-dominated electrical conductivity in thin films) or non-representative sampling of defect distibutions (statistical volume elements).
has super-classes
Use case materials mechanics c, entity influence

Slip bandc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipBand

Bands within the metals in which plastic deformation, i.e., dislocation motion, is concentrated that form during monotonic loading. Typically, slip bands contain dislocation structures.
has super-classes
Damage c
has sub-classes
Persistent slip band c

Slip directionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipDirection

Crystallographic directions given in Miller indices which exhibit the most dense atom packing in which dislocation slip can occur.
has super-classes
Crystallographic entity c

Slip direction familyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipDirectionFamily

The set of equivalent crystallographic directions expressed through MillerIndicesDirection along which dislocation motion, or slip, can occur in a crystal.
has super-classes
Crystallographic entity c

Slip irreversibilityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipIrreversibility

The cyclic slip irreversibility factor is a value which ranges from 0 to 1 and expresses the degree (ratio) in which plastic deformation by slip can be recovered within the reverse half-cycle. It depends on the microstructure and loading amplitude.
has super-classes
Microstructural property c

Slip linesc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipLines

Steps at interfaces fromed by dislocation absorption.
has super-classes
Damage c

Slip markingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipMarking

An accumulation of slip lines forms a slip marking at an interface (e.g., the surface)
has super-classes
Damage c

Slip planec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipPlane

Crystallographic planes given in Miller indices which exhibit the most dense atom packing in which dislocation slip can occur.
has super-classes
Crystallographic entity c

Slip plane familyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipPlaneFamily

A family of symmetrically equivalent slip planes.
has super-classes
Crystallographic entity c

Slip systemc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipSystem

A combination of a slip plane and a contained slip direction.
has super-classes
Crystallographic entity c

Slip system familyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SlipSystemFamily

A family of symmetrically equivalent slip systems.
has super-classes
Crystallographic entity c

SN curvec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SNCurve

A set of datapoints expressed as stress amplitude-lifetime pairs, where each datapoint is derived from a fatigue test on a single sample. SN curves are used in materials science to describe the fatigue behaviour for a given material under specific loading conditions for a range of strain amplitudes.
has super-classes
Mechanical test data set c

Solid solutionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SolidSolution

Crystal containing further chemical elements with variable amount where the chemical elements fit into and is distributed in the lattice of the host crystal.
has super-classes
Phase c

Solid solution strengtheningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SolidSolutionStrengthening

A mechanism used in alloying that enhances the strength of an alloy by adding a chemical element as a solute into a solvent forming a solid solution in the solid state.
has super-classes
Mechanism c

Specific heat capacityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SpecificHeatCapacity

The amount of heat energy required to raise the temperature of 1 kg of a material by 1 Kelvin.
has super-classes
Thermal property c

Specific strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SpecificStrength

The specific strength is a material's tensile strength (at failure) divided by its density.
has super-classes
Mechanical property c

Specific weightc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SpecificWeight

The specific weight of a material can be computed by multiplying the density with the standard gravity.
has super-classes
Mass materials property c

Specimen gauge diameterc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SpecimenGaugeDiameter

Specimen diameter of a round specimen in mm
has super-classes
Test specimen property c

Specimen gauge lengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SpecimenGaugeLength

total specimen length in mm
has super-classes
Test specimen property c

Specimen gauge thicknessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SpecimenGaugeThickness

Thickness of a rectangular specimen in mm
has super-classes
Test specimen property c

Specimen gauge widthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SpecimenGaugeWidth

The width of the section of a material specimen which is characterized during testing.
has super-classes
Test specimen property c

Stacking fault c back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StackingFault

Irregular stacking patterns of crystal planes are associated with an increase in energy.
has super-classes
Planar defect c

State descriptorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StateDescriptor

A descriptor or specifer that describes the current state of a material or system, such as "as-printed", which describes the state after 3D printing without further processing.
has super-classes
Descriptor c

Strainc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Strain

A strain is defined as the deformation that occurs in a material when it is subjected to an external force or stress. Strain is a dimensionless quantity that describes the relative change in size, shape, or volume of a material due to stress.
has super-classes
Physical quantity c
has sub-classes
Engineering strain c, Engineering strain in loading direction c

Strain amplitudec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StrainAmplitude

A test parameter which expresses a strain amplitude applied during a strain-controlled fatigue test.
has super-classes
Mechanical test parameter c
has sub-classes
Nominal strain amplitude c

Strain hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StrainHardening

An increase in strength of a material due to plastic deformation.
has super-classes
Mechanism c

Strain hardening exponentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StrainHardeningExponent

A material property that indicates the ability of a metal to strain harden during cold working, i.e. plastic deformation at temperatures below the recrystallization temperature. It is a measure of the slope in the plastic regime of the stress-strain curve.
has super-classes
Mechanical property c

Strain life curvec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StrainLifeCurve

A graphical representation of the relationship between strain and the number of cycles to failure in fatigue testing.
has super-classes
Mechanical test data set c

Strain ratec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StrainRate

The time derivate of the strain
has super-classes
Mechanical test parameter c

Strain ratioc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StrainRatio

The ratio between minimum and maximum strain within a strain-controlled fatigue experiment, i.e. equivalent to the R-ratio in load-controlled fatigue experiments.
has super-classes
Mechanical test parameter c

Strain-controlledc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Straincontrolled

A control type during mechanical testing where the strain in a material is the controlled variable.
has super-classes
Control type c

Strength coefficientc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StrengthCoefficient

has super-classes
Mechanical property c

Stressc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Stress

Stress is defined as the force per unit area that is exerted on a material when an external force is applied to it. Stress is a tensor quantity, which means it has both magnitude and direction and can be described by a matrix of nine components.
has super-classes
Physical quantity c
has sub-classes
Engineering stress c, Engineering stress in loading direction c

Stress amplitudec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StressAmplitude

One half the algebraic difference between the maximum and minimum stress in one fatigue test cycle.
has super-classes
Mechanical test parameter c
has sub-classes
Nominal stress amplitude c

Stress concentration factorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StressConcentrationFactor

The stress concentration factor Kt expresses the ratio of the highest stress to a nominal stress of the cross cross section (Kt = S_max/S_nominal). For an unnotched specimen, K_t = 1, for notched specimens K_t > 1
has super-classes
Test specimen property c

Stress corrosion cracking crack growth ratec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StressCorrosionCrackingCrackGrowthRate

The speed (mm/s) at which a crack propagates in a material under the combined effects of tensile stress and a corrosive environment.
has super-classes
Mechanical property c

Stress intensity rangec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StressIntensityRange

the range (max-min) of stress intensity factors
has super-classes
Mechanical property c

Stress rangec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StressRange

The algebraic difference between the maximum and minimum stress in one fatigue test cycle.
has super-classes
Mechanical test parameter c

Striations marksc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/StriationsMarks

Ripple features on fracture surfaces which indicate the incremental growth of a crack and the crack's holding positions.
has super-classes
Damage c

Strontiumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Sr

Content of element
has super-classes
Chemical element c

Substitional atomc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SubstitionalAtom

A substitational atom replaces the regular motif by an atom of another element
has super-classes
Point defect c

Sulfurc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/S

Content of element
has super-classes
Chemical element c

Surfacec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Surface

The outermost layer or boundary of a material or object.
has super-classes
Location c

Surface defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SurfaceDefect

SurfaceDefects are defects at the free surface of a material
has super-classes
Defect c

Surface finish factorc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SurfaceFinishFactor

A measure of the smoothness of the component surface ranging from 0 to 1 in value. An empirical correction is applied where the surface finish factor is multiplied with the fatigue limit obtained from polished laboratory samples to estimate component-relevant fatigue limits.
has super-classes
Test specimen property c

Surface hardnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SurfaceHardness

Value of the hardness, measured at the specimen surface. Hardness unit can vary between different series or even specimens, therefore it is specified by an additional cell "hardness unit".
has super-classes
Mechanical property c

Surface roughnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/SurfaceRoughness

Different measures for fluctuations of specimen surface topography at the microscopic scale (R_a, R_z, skewness, etc.), including other surface texture parameters.
has super-classes
Test specimen property c

Tangent modulusc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TangentModulus

The slope of the stress-strain curve at any specified stress or strain.
has super-classes
Mechanical property c

Temperaturec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Temperature

Temperature is a measure of the average kinetic energy of the particles (atoms or molecules) in a substance or system. In simpler terms, it represents how hot or cold an object or environment is relative to a reference point. It is a scalar quantity. The standard unit of Temperature in the International System of Units (SI) is Kelvin (K).
has super-classes
Physical quantity c

Temperingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Tempering

Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys. Tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to some temperature below the critical point for a certain period of time, then allowing it to cool in still air.
has super-classes
Heat treatment c

Tensile strain to failurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TensileStrainToFailure

has super-classes
Mechanical property c

Tensile ultimate strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TensileUltimateStrength

The maximum stress that a material can withstand in a quasistatic tensile test before breaking.
has super-classes
Mechanical property c

Tensile yield strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TensileYieldStrength

The maximum stress that a material can withstand without deforming permanently when subjected to stretching.
has super-classes
Mechanical property c

Test specimenc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TestSpecimen

A test specimen is a specimen which a defined geometry for a specific characterization process.
has super-classes
Sample c
has sub-classes
Fatigue test specimen c

Test specimen propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TestSpecimenProperty

A specimen property are characteristics specific to TestSpecimens.
has super-classes
Property c
has sub-classes
Cross-section geometry c, Fatigue notch factor c, Fatigue notch sensitivity c, Notch diameter c, Notch radius c, Specimen gauge diameter c, Specimen gauge length c, Specimen gauge thickness c, Specimen gauge width c, Stress concentration factor c, Surface finish factor c, Surface roughness c

Testing machinec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TestingMachine

Name of testing machine used for conducting the fatigue test
has super-classes
Equipment c

Testing mediumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TestingMedium

The environment at which the tests have been carried out, e.g. air
has super-classes
Environmental test parameter c, medium

Thermal coefficient of resistivityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ThermalCoefficientOfResistivity

The rate at which the electrical resistivity of a material changes with temperature.
has super-classes
Electrical property c

Thermal conductivityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ThermalConductivity

The degree to which a material exposed to a temperature gradient conducts heat. Measured in W/(mK).
has super-classes
Thermal property c

Thermal diffusivityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ThermalDiffusivity

A measure of how quickly a material can conduct thermal energy which is computed by dividing the thermal conductivity by density and by specific heat capacity at constant pressure.
has super-classes
Thermal property c

Thermal propertyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ThermalProperty

The set of materials properties that describe its behavior in response to changes in temperature, including heat capacity, thermal conductivity, and thermal expansion coefficient.
has super-classes
Material property c
has sub-classes
Coefficient of heat transfer c, Diffusion frequency factor c, Glass transition temperature c, Heat capacity c, Latent heat of evaporation c, Liquidus temperature c, Melting point c, Melting range c, Specific heat capacity c, Thermal conductivity c, Thermal diffusivity c, Vapor pressure c

Thermocouplec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Thermocouple

A thermoelectric sensor based on the Seebeck effect used to measure temperature by correlating the voltage difference between two different types of conductive material.
has super-classes
Sensor c

Thermography camerac back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ThermographyCamera

An imaging device that captures the infrared radiation emitted by objects, allowing for temperature measurements.
has super-classes
Detector c

Thermography measurementc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ThermographyMeasurement

The use of an infrared imaging camera to measure the spatially-resolved thermal energy emitted from an object in a quantitative manner.
has super-classes
Image acquisition c

Thermomechanical treatmentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/ThermomechanicalTreatment

A process that combines heat treatment and plastic deformation to improve the mechanical and physical properties of a material.
has super-classes
Manufacturing process c
has sub-classes
Hot forging c

Tilt boundaryc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TiltBoundary

A type of grain boundary where the misorientation between the two grains is due to a rotation about an axis that lies in the grain boundary plane.
has super-classes
Grain boundary c

Tilt boundary segmentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TiltBoundarySegment

Tilt boundary segments are grain boundary segments where the crystallographic misorientation axis (eigenvector) is contained within the grain boundary plane.
has super-classes
Grain boundary segment c

Tinc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Sn

Content of element
has super-classes
Chemical element c

Titaniumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Ti

Content of element
has super-classes
Chemical element c

Torsional strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TorsionalStrength

The maximum amount of torsional stress that a material can withstand before failure.
has super-classes
Mechanical property c

Transmission electron microscopec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TransmissionElectronMicroscope

An electron microscope that transmits a beam through a thin specimen and forms an image from those electrons transmitted.
has super-classes
Microscope c

Transmission electron microscopy measurementc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TransmissionElectronMicroscopyMeasurement

A microscopy technique which facilitates observations on the nanoscale in which a beam of electrons is transmitted through an ultra-thin specimen, interacting with the specimen as it passes through. The transmitted beam is analyzed using detectors.
has super-classes
Image acquisition c

Triangularc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Triangular

Type of loading (tension/compression, rotation bending, bending, shearing, torsion)
has super-classes
Loading type c

Triple junctionc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TripleJunctionLine

A point at which three adjacent grains meet.
has super-classes
Line defect c

Turningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Turning

Turning is a machining process in which a cutting tool, typically a non-rotary tool bit, describes a helix toolpath by moving more or less linearly while the workpiece rotates.
has super-classes
Machining process c

Twin boundaryc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TwinBoundary

Twin boundaries are special grain boundaries with a high degree of symmetry across the boundary and low interface energies.
has super-classes
Grain boundary c

Twist boundaryc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TwistBoundary

A type of grain boundary in a crystalline material where the misorientation axis is normal to the grain boundary.
has super-classes
Grain boundary c

Twist boundary segmentc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/TwistBoundarySegment

Twist boundary segments are grain boundary segments where the crystallographic misorientation axis (eigenvector) is normal to a grain boundary plane.
has super-classes
Grain boundary segment c

Ultimate shear strengthc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/UltimateShearStrength

The maximum shear stress that a material can endure before failure.
has super-classes
Mechanical property c

Uniaxial tensile testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/UniaxialTensileTest

A mechanical test in which an uniaxial tensile load is applied and streadily increased, e.g. in a servohydraullic system, while the strain of a tensile test specimen is measured.
has super-classes
Mechanical test c

Use case materials mechanicsc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/UseCaseMaterialsMechanics

has sub-classes
Chemical c, Data set c, Descriptor c, Frequency effect c, Geometry c, Identifier c, Mechanism c, Microstructure c, Model c, Object c, Physical quantity c, Process c, Property c, Scale effect c, Size effect c, Value c

Vacancyc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Vacancy

A missing ionic core at a regular basis/motif (i.e. lattice position)
has super-classes
Point defect c

Valuec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Value

A Value is composed of a numerical value and optionally a physical unit.
has super-classes
Use case materials mechanics c

Vanadiumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/V

Content of element
has super-classes
Chemical element c

Vapor pressurec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/VaporPressure

The pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature.
has super-classes
Thermal property c

Very high-cycle fatiguec back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/VeryHighcycleFatigue

VHCF relies on the presence of inclusions at which as a consequence of microscopic plasticity crack nucleation occurs. Other than in the HCF regime, the crack initiation site is not at the surface but internal.
has super-classes
Mechanism c

Very high-cycle fatigue testc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/VeryHighcycleFatigueTest

A fatigue test performed at low cyclic amplitudes of microplasticity to characterize a materials behaviour and incidence of the VHCF mechanism.
has super-classes
Fatigue test c

Vickers hardnessc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/VickersHardness

A measure of hardness, defined as the resistance to indentation, using a Vickers indenter, i.e. a pyramid-shaped diamond tip.
has super-classes
Mechanical property c

Volume defectc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/VolumeDefect

A type of defect in a material which has a significant volumetric extent such as precipitates, inclusions, or pores.
has super-classes
Defect c
has sub-classes
Inclusion c, Pore c, Precipitate c, Segregation c

Waterjet cuttingc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/WaterjetCutting

A fabrication process that uses a high-pressure stream of water to cut materials.
has super-classes
Machining process c

Wave propagation velocityc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/WavePropagationVelocity

A mechanical property which specifies the velocity at which a wave travels through the material/medium of concern.
has super-classes
Mechanical property c

Wire discharge machiningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/WireDischargeMachining

An electrothermal manufacturing process that uses a wire as a tool electrode and electrical discharges to cut conductive workpieces.
has super-classes
Machining process c

Work hardeningc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/WorkHardening

Process by which a metal becomes harder and stronger through targeted application of plastic deformation before the operation of a component.
has super-classes
Hardening process c, Mechanical treatment c

Yield pointc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/YieldPoint

The point at which a material will deform plastically and will not return to its original form.
has super-classes
Mechanical property c

Yield strainc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/YieldStrain

The strain at which a material begins to deform plastically.
has super-classes
Mechanical property c

Zincc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Zn

Content of element
has super-classes
Chemical element c

Zirconiumc back to ToC or Class ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/Zr

Content of element
has super-classes
Chemical element c

Object Properties

aligned withop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/alignedWith

The object property alignedWith describes that the entity representing the subject is aligned to another entity representing an object.

has characteristics: symmetric

has super-properties
top object property
has sub-properties
parallel to op
has domain
entity
has range
entity

associated withop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/associatedWith

associatedWith Is a general object property that describes the concept of association between two entities, i.e. that one entity holds information about another entity.

has characteristics: symmetric

has sub-properties
cause of op, correlated with op

cause ofop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/causeOf

causeOf Is a general object property which describes the concept of causation, i.e. cause-effect relationships. The subject acts as a (direct or indirect) cause for an effect which is represented by the object. This relationship is applied if the subject, i.e. activity, entity, state, is (partly) responsible for another activity, entity, state. Note: An example for an indirect causal relationship is between grain size and flow stress (strength). Before a threshold in grain size the behaviour is dominated by grain boundary sliding (resulting in an increasing trend) while above the strength is dominated by grain boundary resistance to dislocation slip (resulting in a decreasing trend). The lack of a clear increasing or decreasing trend means that grain size and strength are not correlated, even though a causal relationship exists.

has characteristics: irreflexive

has super-properties
associated with op, influenced
has sub-properties
necessary cause of op, sufficient cause of op

constrainsop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/constrains

The constrains object property is used to signify that the subject imposes some bounds on the object.
has super-properties
influenced
has sub-properties
hard constrains op, soft constrains op

correlated withop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/correlatedWith

correlatedWith Is a general object property which indicates linear (Pearson) or non-linear (Spearman) correlation between two entities.

has characteristics: symmetric

has super-properties
associated with op

grows intoop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/growsInto

growsInto object property describes the spatial growth of an entity into an entity of another type. A materials science specific example would be the growth of a microstructurally-short crack into a physically-short crack.

has characteristics: transitive

has super-properties
had derivation, top object property

hard constrainsop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/hardConstrains

The hardConstrains object property is used to signify that the subject imposes hard bounds on the object. For instance, a load cell built into a mechanical testing setup asserts hard bounds to the measurable force.
has super-properties
constrains op

initiates atop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/initiatesAt

The object property initiatesAt describes the initiation of an entity at a specific location. A materials science specific example would be the initiation of a crack at a specific grain boundary segment.
has super-properties
top object property
has domain
Damage c
has range
Defect c

Is Part Ofop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/isPartOf

A related resource in which the described resource is physically or logically included. This object property is transitive.

has characteristics: transitive

has super-properties
Is Part Of

measuresop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/measures

has super-properties
top object property

necessary cause ofop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/necessaryCauseOf

Causation where the presence of the object implies prior occurence of subject (object is only attainable by subject). However, the presence of the subject does not imply that the object will inevitably occur.
has super-properties
cause of op

parallel toop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/parallelTo

The object property parallelTo describes that the entity representing the subject is parallely aligned to another entity representing an object.

has characteristics: symmetric

has super-properties
aligned with op

precedesop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/precedes

has super-properties
top object property

relies onop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/reliesOn

Describes a relation where the object is a necessary condition for the subject to occur.
has super-properties
top object property

soft constrainsop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/softConstrains

The softConstrains object property is used to signify that the subject imposes soft bounds on the object. For instance, in materials engineering, the recycling-induced elevated presence of copper in steel asserts some soft bounds on its processing window to avoid embrittlement and hot shortness.
has super-properties
constrains op

spatially coincides withop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/spatiallyCoincidesWith

The object property spatiallyCoincidesWith describes that the entity representing the subject is spatially coinciding with another entity representing an object. An example is that a specific element (or it‘s ion) occupies a position in a crystal lattice.

has characteristics: symmetric

has domain
entity
has range
entity

sufficient cause ofop back to ToC or Object Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/sufficientCauseOf

Causation where the presence of the subject implies the subsequent occurence of the object. No other conditions need to be fulfilled to cause the object. At the same time, presence of the object does not imply prior occurence of the subject since other entities can result in the same effect.
has super-properties
cause of op

Annotation Properties

alt labelap back to ToC or Annotation Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/altLabel

pref labelap back to ToC or Annotation Property ToC

IRI: https://w3id.org/pmd/materials-mechanics-ontology/prefLabel

Legend back to ToC

c: Classes
op: Object Properties

Acknowledgments back to ToC

The authors would like to thank Silvio Peroni for developing LODE, a Live OWL Documentation Environment, which is used for representing the Cross Referencing Section of this document and Daniel Garijo for developing Widoco, the program used to create the template used in this documentation.