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Designation:D7078/D7078M–05StandardTestMethodforShearPropertiesofCompositeMaterialsbyV-NotchedRailShearMethod1ThisstandardisissuedunderthefixeddesignationD7078/D7078M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheshearpropertiesofhigh-modulusfiber-reinforcedcompositemateri-alsbyclampingtheendsofaV-notchedspecimenbetweentwopairsofloadingrails.Whenloadedintension,therailsintroduceshearforcesintothespecimenthroughthespecimenfaces.Incomparison,thespecimenofTestMethodD5379/D5379Misloadedthroughitstopandbottomedges.Faceloadingallowshighershearforcestobeappliedtothespecimen,ifrequired.Additionally,thepresenttestmethodutilizesaspecimenwithalargergagesectionthantheV-notchedspecimenofTestMethodD5379/D5379M.Inbothtestmethods,theuseofaV-notchedspecimenincreasesthegagesectionshearstressesinrelationtotheshearstressesinthevicinityofthegrips,thuslocalizingthefailurewithinthegagesectionwhilecausingtheshearstressdistributiontobemoreuniformthaninaspecimenwithoutnotches.Incompari-son,TestMethodD4255/D4255Mutilizesanunnotchedspecimenclampedbetweentwopairsofloadingrailsthatareloadedintension.AlsoincontrasttoTestMethodD4255/D4255M,thepresenttestmethodprovidesspecimengrippingwithouttheneedforholesinthespecimen.Thecompositematerialsarelimitedtocontinuous-fiberordiscontinuous-fiber-reinforcedcompositesinthefollowingma-terialforms:1.1.1Laminatescomposedonlyofunidirectionalfibrouslaminae,withthefiberdirectionorientedeitherparallelorperpendiculartothefixturerails.1.1.2Laminatesofbalancedandsymmetricconstruction,withthe0°directionorientedeitherparallelorperpendiculartothefixturerails.1.1.3Laminatescomposedofwoven,braided,orknittedfabricfilamentarylaminae.1.1.4Short-fiber-reinforcedcompositeswithamajorityofthefibersbeingrandomlydistributed.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetexttheinch-poundunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D792TestMethodsforDensityandSpecificGravity(Rela-tiveDensity)ofPlasticsbyDisplacementD883TerminologyRelatingtoPlasticsD2584TestMethodforIgnitionLossofCuredReinforcedResinsD2734TestMethodsforVoidContentofReinforcedPlas-ticsD3171TestMethodsforConstituentContentofCompositeMaterialsD3878TerminologyforCompositeMaterialsD4255/D4255MTestMethodforIn-PlaneShearProper-tiesofPolymerMatrixCompositeMaterialsbytheRailShearMethodD5229/D5229MTestMethodforMoistureAbsorptionPropertiesandEquilibriumConditioningofPolymerMa-trixCompositeMaterialsD5379/D5379MTestMethodforShearPropertiesofCompositeMaterialsbytheV-NotchedBeamMethodD6856GuideforTestingFabric-ReinforcedTextileCom-positeMaterialsE4PracticesforForceVerificationofTestingMachinesE6TerminologyRelatingtoMethodsofMechanicalTest-ingE111TestMethodforYoung’sModulus,TangentModulus,andChordModulusE122PracticeforCalculatingofSampleSizetoEstimate,1ThistestmethodisunderthejurisdictionofASTMCommitteeD30onCompositeMaterialsandisthedirectresponsibilityofSubcommitteeD30.04onLaminaandLaminateTestMethods.CurrenteditionapprovedMay15,2005.PublishedAugust2005.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.1Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.WithaSpecifiedTolerableError,theAverageforCharac-teristicofaLotorProcessE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE251TestMethodsforPerformanceCharacteristicsofMetallicBondedResistanceStrainGagesE456TerminologyRelatingtoQualityandStatisticsE1237GuideforInstallingBondedResistanceStrainGagesE1309GuideforIdentificationofFiber-ReinforcedPoly-merMatrixCompositeMaterialsinDatabasesE1434GuideforMechanicalTestDataofFiber-ReinforcedCompositeMaterialsinDatabases2.2OtherDocuments:ANSIY14.5M-1982GeometricDimensioningandToler-ancing3ANSI/ASMEB46.1-1985SurfaceTexture(SurfaceRough-ness,Waviness,andLay)32.3ASTMAdjuncts:V-NotchedRailShearFixtureMachiningDrawings43.Terminology3.1Definitions—TerminologyD3878definestermsrelatingtohigh-modulusfibersandtheircomposites.TerminologyD883definestermsrelatingtoplastics.TerminologyE6definestermsrelatingtomechanicaltesting.TerminologyE456andPracticeE177definetermsrelatingtostatistics.Intheeventofaconflictbetweenterms,TerminologyD3878shallhaveprecedenceovertheothertermi
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