Designation:D6415/D6415M−22StandardTestMethodforMeasuringtheCurvedBeamStrengthofaFiber-ReinforcedPolymer-MatrixComposite1ThisstandardisissuedunderthefixeddesignationD6415/D6415M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddeterminesthecurvedbeamstrengthofacontinuousfiber-reinforcedcompositematerialusinga90°curvedbeamspecimen(Figs.1and2).Thecurvedbeamconsistsoftwostraightlegsconnectedbya90°bendwitha6.4mm[0.25in.]innerradius.Anout-of-plane(through-the-thickness)tensilestressisproducedinthecurvedregionofthespecimenwhenforceisapplied.Thistestmethodislimitedtousewithcompositesconsistingoflayersoffabricorlayersofunidirectionalfibers.1.2Thistestmethodmayalsobeusedtomeasuretheinterlaminartensilestrengthifaunidirectionalspecimenisusedwherethefibersruncontinuouslyalongthelegsandaroundthebend.1.3Thistestmethodislimitedtousewithcompositesconsistingoflayersoffabricorlayersofunidirectionalfibers.1.4Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequiva-lents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.4.1Withinthetext,theinch-poundunitsareshowninbrackets.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarr...
