Designation:D813−07(Reapproved2019)StandardTestMethodforRubberDeterioration—CrackGrowth1ThisstandardisissuedunderthefixeddesignationD813;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationofcrackgrowthofvulcanizedrubberwhensubjectedtorepeatedbendingstrainorflexing.ItisparticularlyapplicabletotestsofsyntheticrubbercompoundswhichresisttheinitiationofcrackingduetoflexingwhentestedbyMethodBofTestMethodsD430.Crackinginitiatedinthesematerialsbysmallcutsortearsinservice,mayrapidlyincreaseinsizeandprogresstocompletefailureeventhoughthematerialisextremelyresistanttotheoriginalflexing-fatiguecracking.Becauseofthischaracteristicofsyntheticcompounds,particu-larlythoseoftheSBRtype,thistestmethodinwhichthespecimensarefirstartificiallypuncturedintheflexareashouldbeusedinevaluatingthefatigue-crackingpropertiesofthisclassofmaterial.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D430TestMethodsforRubberDeterioration—DynamicFatigueD1349PracticeforRubber—StandardConditionsforTest-ingD3182PracticeforRubber—Materials,Equipment,andPro-c...
