Designation:D7291/D7291M−22StandardTestMethodforThrough-Thickness“Flatwise”TensileStrengthandElasticModulusofaFiber-ReinforcedPolymerMatrixCompositeMaterial1ThisstandardisissuedunderthefixeddesignationD7291/D7291M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddeterminesthethrough-thickness“flat-wise”tensilestrengthandelasticmodulusoffiberreinforcedpolymermatrixcompositematerials.Atensileforceisappliednormaltotheplaneofthecompositelaminateusingadhesivelybondedthickmetalend-tabs.Thecompositematerialformsarelimitedtocontinuousfiber(unidirectionalreinforcementortwo-dimensionalfabric)ordiscontinuousfiber(nonwovenorchopped)reinforcedcomposites.1.2Thethrough-thicknessstrengthresultsusingthistestmethodwillingeneralnotbecomparabletoTestMethodD6415sincethismethodsubjectsarelativelylargevolumeofmaterialtoanalmostuniformstressfieldwhileTestMethodD6415subjectsasmallvolumeofmaterialtoanon-uniformstressfield.1.3Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequiva-lents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.3.1Withinthetext,theinch-poundunitsareshowninbrackets.1.4Thisstandardmayinvolvehazardousmaterials,operations,andequipment.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalS...
