Designation:D6415/D6415M−06a(Reapproved2013)StandardTestMethodforMeasuringtheCurvedBeamStrengthofaFiber-ReinforcedPolymer-MatrixComposite1ThisstandardisissuedunderthefixeddesignationD6415/D6415M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddeterminesthecurvedbeamstrengthofacontinuousfiber-reinforcedcompositematerialusinga90°curvedbeamspecimen(Fig.1andFig.2).Thecurvedbeamconsistsoftwostraightlegsconnectedbya90°bendwitha6.4-mm[0.25in.]innerradius.Anout-of-plane(through-the-thickness)tensilestressisproducedinthecurvedregionofthespecimenwhenforceisapplied.Thistestmethodislimitedtousewithcompositesconsistingoflayersoffabricorlayersofunidirectionalfibers.1.2Thistestmethodmayalsobeusedtomeasuretheinterlaminartensilestrengthifaunidirectionalspecimenisusedwherethefibersruncontinuouslyalongthelegsandaroundthebend.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetexttheinch-poundunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.2.ReferencedDocuments2.1ASTMStandards:2D792TestMethodsforDensityandSpecificGravity(Rela-tiveDensity)ofPlasticsbyDisplacementD883TerminologyRelatingtoPlasticsD3171TestMethodsforConstituentContentofCompositeMaterialsD3878TerminologyforCompositeMaterialsD5229/D5229MTestMethodforMoistureAbsorptionProp-ertiesandEquilibriumConditioningofPolymerMatrixCompositeMaterialsD5687/D5687MGuideforPrep...
