Designation:D5528−13StandardTestMethodforModeIInterlaminarFractureToughnessofUnidirectionalFiber-ReinforcedPolymerMatrixComposites1ThisstandardisissuedunderthefixeddesignationD5528;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethoddescribesthedeterminationoftheopeningModeIinterlaminarfracturetoughness,GIc,ofcon-tinuousfiber-reinforcedcompositematerialsusingthedoublecantileverbeam(DCB)specimen(Fig.1).1.2Thistestmethodislimitedtousewithcompositesconsistingofunidirectionalcarbonfiberandglassfibertapelaminateswithbrittleandtoughsingle-phasepolymermatri-ces.Thislimitedscopereflectstheexperiencegainedinround-robintesting.Thistestmethodmayproveusefulforothertypesandclassesofcompositematerials;however,certaininterferenceshavebeennoted(see6.5).1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandardmayinvolvehazardousmaterials,operations,andequipment.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsD2651GuideforPreparationofMetalSurfacesforAdhesiveBondingD2734TestMethodsforVoidContentofReinforcedPlasticsD3171TestMethodsforConstituentContentofCompositeMaterialsD3878TerminologyforCompositeMaterialsD5229/D5229MTestMethodforMoistureAbsorptionProp-ertiesandEquilibriumConditioningofPolymerMatrixCompositeMaterialsE4PracticesforForceVerificationofTestingMachinesE6TerminologyRelatingtoMethodsofMechanicalTestingE122PracticeforCalculatingSampleSizetoEstimate,WithSpecifiedPrecision,theAverageforaCharacteristicofaLotorProcessE177Pract...
