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1、Designation:D7905D7905M?14StardTestMethodfDeterminationoftheModeIIInterlaminarFractureToughnessofUnidirectionalFiberReinfcedPolymerMatrixComposites1ThisstardisissuedunderthefixeddesignationD7905D7905Mthenumberimmediately

2、followingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1

3、.Scope1.1ThistestmethoddescribesthedeterminationofthemodeIIinterlaminarfracturetoughnessGIIcofunidirectionalfiberreinfcedpolymermatrixcompositelaminatesundermodeIIshearloadingusingtheendnotchedflexure(ENF)test(Fig.1).1.2

4、Thismethodislimitedtousewithcompositesconsistingofunidirectionalcarbonfiberglassfiberreinfcedlaminates.Thislimitedscopereflectstheexperiencegainedinroundrobintesting.Thistestmethodmayproveusefulfothertypesclassesofcompos

5、itematerialshowevercertaininterferenceshavebeennoted(seeSection6).1.3ThevaluesstatedineitherSIunitsinchpoundunitsaretoberegardedseparatelyasstard.Thevaluesstatedineachsystemmaynotbeexactequivalentstherefeeachsystemshallb

6、eusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconfmancewiththestard.1.3.1Withinthetexttheinchpoundunitsareshowninbrackets.1.4Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociate

7、dwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D792TestMethodsfDensitySpecificGr

8、avity(RelativeDensity)ofPlasticsbyDisplacementD883TerminologyRelatingtoPlasticsD2584TestMethodfIgnitionLossofCuredReinfcedResinsD2734TestMethodsfVoidContentofReinfcedPlasticsD3171TestMethodsfConstituentContentofComposite

9、MaterialsD3878TerminologyfCompositeMaterialsD5229D5229MTestMethodfMoistureAbsptionPropertiesEquilibriumConditioningofPolymerMatrixCompositeMaterialsD5687D5687MGuidefPreparationofFlatCompositePanelswithProcessingGuideline

10、sfSpecimenPreparationD7264D7264MTestMethodfFlexuralPropertiesofPolymerMatrixCompositeMaterialsE4PracticesfFceVerificationofTestingMachinesE6TerminologyRelatingtoMethodsofMechanicalTestingE18TestMethodsfRockwellHardnessof

11、MetallicMaterialsE122PracticefCalculatingSampleSizetoEstimateWithSpecifiedPrecisiontheAveragefaacteristicofaLotProcessE177PracticefUseoftheTermsPrecisionBiasinASTMTestMethodsE456TerminologyRelatingtoQualityStatisticsE691

12、PracticefConductinganInterlabatyStudytoDeterminethePrecisionofaTestMethodE1309GuidefIdentificationofFiberReinfcedPolymerMatrixCompositeMaterialsinDatabasesE1434GuidefRecdingMechanicalTestDataofFiberReinfcedCompositeMater

13、ialsinDatabasesE1471GuidefIdentificationofFibersFillersCeMaterialsinComputerizedMaterialPropertyDatabases3.Terminology3.1TerminologyD3878definestermsrelatingtohighmodulousfiberstheircomposites.TerminologyD883definesterms

14、relatingtoplastics.TerminologyE6definestermsrelatingtomechanicaltesting.TerminologyE456PracticeE177definetermsrelatingtostatistics.IntheeventofconflictbetweentermsTerminologyD3878shallhaveprecendenceovertheotherterminolo

15、gystards.1ThistestmethodisunderthejurisdictionofASTMCommitteeD30onCompositeMaterialsisthedirectresponsibilityofSubcommitteeD30.06onInterlaminarProperties.CurrenteditionapprovedOct.12014.PublishedNovember2014.DOI:10.1520D

16、7905_D7905M142FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInternational100BarrHa

17、rbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates13.3.29r2—radiusofthesupptrollers(Fig.2)3.3.30r2—crelationcoefficientoflinearfitofcomplianceversuscracklengthcubed3.3.31?s—Maximummeasureddifferenceincracklengthalo

18、ngthedelaminationfrontoftheprecrack3.3.32U—totalelasticstrainenergyinthespecimen4.SummaryofTestMethod4.1TheENFspecimenshowninFig.1consistsofarectangularunifmthicknessunidirectionallaminatedcompositespecimencontaininganon

19、adhesiveattheplanethatservesasadelaminationinitiat.FcesareappliedtothespecimenthroughanENFfixtureunderdisplacementcontrolledloading.4.2DelaminationgrowthisnotstableintheENFtest.Amethodispresentedsothattheinitiationvalues

20、ofthemodeIIinterlaminarfracturetoughnessareobtainedfromthepreimplantedaswellasfromaprecrack.4.3Arecdoftheappliedfceversuscenterrollerdisplacementistobeobtainedusinganxyrecderequivalentrealtimeplottingdeviceelseitmaybeobt

21、ainedsteddigitally.ThemodeIIinterlaminarfracturetoughnessGIIcisobtainedusingthecompliancecalibration(CC)method.Thisistheonlyacceptablemethodofdatareductionfthistest(1).34.4ThisstardrecommendsthatstaticmodeIIprecrackingis

22、perfmedarecommendedmethodisdescribed.OtherprecrackingmethodsmaybeusedprovidedthatarecdoftheshapeoftheprecrackeddelaminationfrontisobtainedpritothePCtest.Precrackingmethodsthattypicallyleavecrackfrontmarkingsfposttesteval

23、uationofthesevaluesincludemodeIfatiguemodeII.5.SignificanceUse5.1Susceptibilitytodelaminationisoneofthemajdesignconcernsfmanyadvancedlaminatedcompositestructures.Knowledgeofalaminatedcompositematerial’sresistancetointerl

24、aminarfractureisusefulfproductdevelopmentmaterialion.FurthermeameasurementofthemodeIIinterlaminarfracturetoughnessthatisindependentofspecimengeometrymethodoffceintroductionisusefulfestablishingdesignallowablesusedindamag

25、etoleranceanalysesofcompositestructures.Knowledgeofboththenonprecrackedprecrackedtoughnessesallowstheappropriatevaluetobeusedftheapplicationofinterest.5.2Thistestmethodcanservethefollowingpurposes:5.2.1Toestablishquantit

26、ativelytheeffectoffibersurfacetreatmentlocalvariationsinfibervolumefractionprocessingenvironmentalvariablesonGIIcofaparticularcompositematerial5.2.2TocomparequantitativelytherelativevaluesofGIIcfcompositematerialswithdif

27、ferentconstituents5.2.3TocomparequantitativelythevaluesofGIIcobtainedfromdifferentbatchesofaspecificcompositematerialfexampletouseasamaterialscreeningcriteriontodevelopadesignallowable5.2.4Todevelopdelaminationfailurecri

28、teriafcompositedamagetolerancedurabilityanalyses.6.Interferences6.1LinearelasticbehaviisassumedinthecalculationofGusedinthismethod.Thisassumptionisvalidwhenthezoneofdamagenonlineardefmationatthedelaminationfrontbothissma

29、llrelativetothesmallestspecimendimensionwhichistypicallythespecimen’sthicknessftheENFtest.6.2GIIcisobtainedfbothnonprecrackedprecrackedspecimensbasedonthemaximumloadpoint.GIIcbasedonthenonlinearloadpointothermeasuressuch

30、asacomplianceoffsetmayalsobeobtainedifdesired.HoweverdefinitionsofthistypehavenotbeenrelatedtoanyspecificphysicaloccurrencesintheENFtest.6.3ThethreeloadingnosesintheENFtestfixturemaybefixedrotatablerolling.Fixedloadingno

31、sespinssupptedinavgroovearerecommendedloadingnosesofthistypewereusedintheinterlabatytestprogramthatwasconductedinsupptofthisstard.ThetypeofsupptsthatareusedistobereptedasdescribedinSection14.Theloadingnosesshouldunifmlyc

32、ontactthespecimenacrossitswidth.Lackofunifmcontactcanaffectresultsmostcommonlyduetononunifmloadingacrossthewidthofthe3Theboldfacenumbersinparenthesesrefertoalistofreferencesattheendofthisstard.FIG.2ENFSpecimenFixtureDime

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