Designation:D4482−11StandardTestMethodforRubberProperty—ExtensionCyclingFatigue1ThisstandardisissuedunderthefixeddesignationD4482;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoffatiguelifeofrubbercompoundsundergoingatensile-straincycle.Duringpartofthecycle,thestrainisrelaxedtoazerovalue.Thespecimensaretestedwithoutintentionallyinitiatedflaws,cuts,orcracks.Failureisindicatedbyacompleteruptureofthetestspecimen.1.2Noexactcorrelationbetweenthesetestresultsandserviceisgivenorimplied.Thisisduetothevariednatureofserviceconditions.Thesetestproceduresdoyielddatathatcanbeusedforthecomparativeevaluationofrubbercompoundsfortheirabilitytoresist(dynamic)extensioncyclingfatigue.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3182PracticeforRubber—Materials,Equipment,andPro-ceduresforMixingStandardCompoundsandPreparingStandardVulcanizedSheetsD3767PracticeforRubber—MeasurementofDimensionsD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries2.2BritishStandard:BS5324GuidetoApplicationofStatisticstoRubberTest-ing33.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1extensionratio—theratiooftheextendedlengthofaspecimen,L,totheunextendedlength,Lo,calculatedasfollows:λ5LLo(1)3.1.2fatiguelife(sample)—thegeometricmeanormedianvalueofthenumberofcyclesrequiredtocausefailureforanumberofspecimensofthesample.3.1.3fatiguelife(specimen)—thetotal...
