Designation:E2368−10StandardPracticeforStrainControlledThermomechanicalFatigueTesting1ThisstandardisissuedunderthefixeddesignationE2368;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthedeterminationofthermome-chanicalfatigue(TMF)propertiesofmaterialsunderuniaxiallyloadedstrain-controlledconditions.A“thermomechanical”fatiguecycleisheredefinedasaconditionwhereuniformtemperatureandstrainfieldsoverthespecimengagesectionaresimultaneouslyvariedandindependentlycontrolled.ThispracticeisintendedtoaddressTMFtestingperformedinsupportofsuchactivitiesasmaterialsresearchanddevelopment,mechanicaldesign,processandqualitycontrol,productperformance,andfailureanalysis.Whilethispracticeisspecifictostrain-controlledtesting,manysectionswillprovideusefulinformationforforce-controlledorstress-controlledTMFtesting.1.2Thispracticeallowsforanymaximumandminimumvaluesoftemperatureandmechanicalstrain,andtemperature-mechanicalstrainphasing,withtherestrictionbeingthatsuchparametersremaincyclicallyconstantthroughoutthedurationofthetest.Norestrictionsareplacedonenvironmentalfactorssuchaspressure,humidity,environmentalmedium,andothers,providedthattheyarecontrolledthroughoutthetest,donotcauselossoforchangeinspecimendimensionsintime,andaredetailedinthedatareport.1.3Theuseofthispracticeislimitedtospecimensanddoesnotcovertestingoffull-scalecomponents,structures,orconsumerproducts.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.2.ReferencedDocuments2.1ASTMStandards:2E3GuideforPreparationofMetallographicSpecimensE4PracticesforForceVerificationofTestingMachinesE83PracticeforVerificationandClassificationofExten-someterSystemsE111TestMethodforYoung’sModulus,TangentModulus,andChordModulusE112TestMethodsforDetermin...
