@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix matsci: <https://w3id.org/matsci-sam/metadata#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://w3id.org/matsci-sam/vocabulary/mrc/fatigue> a skos:Concept ;
  skos:inScheme <https://w3id.org/matsci-sam/vocabulary/mrc> ;
  skos:prefLabel "fatigue"@en ;
  matsci:canonicalDefinition <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/2> ;
  skos:definition <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/1/revisions/1> ;
  skos:definition <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/2/revisions/2> ;
  skos:definition <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/3/revisions/1> ;
  dcterms:contributor "Christopher Rauch" ;
  dcterms:contributor "gemma4:26b" ;
  dcterms:created "2026-07-21"^^xsd:date .

<https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/1> a matsci:Definition ;
  dcterms:isPartOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue> ;
  matsci:definitionNumber "1"^^xsd:positiveInteger ;
  matsci:currentRevision <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/1/revisions/1> ;
  dcterms:hasVersion <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/1/revisions/1> ;
  dcterms:created "2026-07-21T14:25:39.225Z"^^xsd:dateTime .

<https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/1/revisions/1> a matsci:DefinitionRevision ;
  rdf:value "When metal breaks after being bent or loaded over and over, even if the load is small."@en ;
  skos:example "The bracket failed from fatigue after thousands of flight cycles."@en ;
  dcterms:isVersionOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/1> ;
  prov:specializationOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/1> ;
  dcterms:creator "Christopher Rauch" ;
  matsci:version "1"^^xsd:positiveInteger ;
  matsci:status "proposed" ;
  dcterms:created "2026-07-21T14:25:39.225Z"^^xsd:dateTime .

<https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/2> a matsci:Definition ;
  dcterms:isPartOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue> ;
  matsci:definitionNumber "2"^^xsd:positiveInteger ;
  matsci:currentRevision <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/2/revisions/2> ;
  dcterms:hasVersion <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/2/revisions/2> ;
  dcterms:created "2026-07-21T14:25:40.709Z"^^xsd:dateTime .

<https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/2/revisions/2> a matsci:DefinitionRevision ;
  rdf:value "The process of progressive structural damage occurring in a material subjected to cyclic or fluctuating stresses, where failure typically initiates at stress levels significantly below the material's yield strength; the mechanism consists of three distinct stages: crack initiation (nucleation), crack propagation (growth through the microstructure), and final fracture (sudden catastrophic failure once the remaining cross-section can no longer support the load)."@en ;
  skos:example "The turbine blade developed a microscopic surface fissure due to fatigue, which eventually propagated through the airfoil until the residual thickness reached a critical limit."@en ;
  dcterms:isVersionOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/2> ;
  prov:specializationOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/2> ;
  dcterms:creator "gemma4:26b" ;
  matsci:version "2"^^xsd:positiveInteger ;
  matsci:status "proposed" ;
  dcterms:created "2026-07-21T10:26:04.060Z"^^xsd:dateTime .

<https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/3> a matsci:Definition ;
  dcterms:isPartOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue> ;
  matsci:definitionNumber "3"^^xsd:positiveInteger ;
  matsci:currentRevision <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/3/revisions/1> ;
  dcterms:hasVersion <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/3/revisions/1> ;
  dcterms:created "2026-07-21T14:26:24.695Z"^^xsd:dateTime .

<https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/3/revisions/1> a matsci:DefinitionRevision ;
  rdf:value "Fatigue is a progressive structural damage process that occurs when a material is subjected to cyclic loading. This phenomenon leads to failure at stress levels significantly lower than the material's ultimate tensile strength or yield strength. The fatigue process typically proceeds through three distinct stages: crack initiation, where microstructural defects or surface irregularities develop into cracks; crack propagation, where the crack grows incrementally with each cycle; and final fracture, where the remaining cross-sectional area can no longer support the applied load, leading to sudden failure."@en ;
  skos:example "The bracket failed from fatigue after experiencing thousands of flight cycles, as cyclic aerodynamic loads drove a crack from initiation through propagation until reaching the critical fracture toughness."@en ;
  dcterms:isVersionOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/3> ;
  prov:specializationOf <https://w3id.org/matsci-sam/vocabulary/mrc/fatigue/definitions/3> ;
  dcterms:creator "Christopher Rauch" ;
  matsci:version "1"^^xsd:positiveInteger ;
  matsci:status "proposed" ;
  dcterms:created "2026-07-21T14:26:24.695Z"^^xsd:dateTime .