ASTM-D-7264-树脂基复合材料弯曲性能测试标准方法

Designation:D7264/D7264M–07StandardTestMethodforFlexuralPropertiesofPolymerMatrixCompositeMaterials1ThisstandardisissuedunderthefixeddesignationD7264/D7264M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddeterminestheflexuralstiffnessandstrengthpropertiesofpolymermatrixcomposites.1.1.1ProcedureA—Athree-pointloadingsystemutilizingcenterloadingonasimplysupportedbeam.1.1.2ProcedureB—Afour-pointloadingsystemutilizingtwoloadpointsequallyspacedfromtheiradjacentsupportpoints,withadistancebetweenloadpointsofone-halfofthesupportspan.NOTE1—UnlikeTestMethodD6272,whichallowsloadingatbothone-thirdandone-halfofthesupportspan,inordertostandardizegeometryandsimplifycalculationsthisstandardpermitsloadingatonlyone-halfthesupportspan.1.2Forcomparisonpurposes,testsmaybeconductedac-cordingtoeithertestprocedure,providedthatthesameprocedureisusedforalltests,sincethetwoproceduresgenerallygiveslightlydifferentpropertyvalues.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetext,theinch-poundunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D790TestMethodsforFlexuralPropertiesofUnreinforcedandReinforcedPlasticsandElectricalInsulatingMaterialsD2344/D2344MTestMethodforShort-BeamStrengthofPolymerMatrixCompositeMaterialsandTheirLaminatesD3878TerminologyforCompositeMaterialsD5229/D5229MTestMethodforMoistureAbsorptionPropertiesandEquilibriumConditioningofPolymerMa-trixCompositeMaterialsD5687/D5687MGuideforPreparationofFlatCompositePanelswithProcessingGuidelinesforSpecimenPrepara-tionD6272TestMethodforFlexuralPropertiesofUnreinforcedandReinforcedPlasticsandElectricalInsulatingMaterialsbyFour-PointBendingD6856GuideforTestingFabric-Reinforced“Textile”Com-positeMaterialsE4PracticesforForceVerificationofTestingMachinesE6TerminologyRelatingtoMethodsofMechanicalTestingE18TestMethodsforRockwellHardnessofMetallicMa-terialsE122PracticeforCalculatingSampleSizetoEstimate,WithSpecifiedPrecision,theAverageforaCharacteristicofaLotorProcessE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE456TerminologyRelatingtoQualityandStatisticsE1309GuideforIdentificationofFiber-ReinforcedPolymer-MatrixCompositeMaterialsinDatabasesE1434GuideforRecordingMechanicalTestDataofFiber-ReinforcedCompositeMaterialsinDatabases2.2OtherDocuments:ANSIY14.5-1999DimensioningandTolerancing—IncludesInchandMetric3ANSIB46.1-1995SurfaceTexture(SurfaceRoughness,WavinessandLay)33.Terminology3.1Definitions—TerminologyD3878definesthetermsre-latingtohigh-modulusfibersandtheircomposites.Terminol-ogyE6definestermsrelatingtomechanicaltesting.Terminol-ogyE456andPracticeE177definetermsrelatingtostatistics.Intheeventofaconflictbetweenterms,TerminologyD3878shallhaveprecedenceovertheotherdocuments.1ThistestmethodisunderthejurisdictionofASTMCommitteeD30onCompositeMaterialsandisthedirectresponsibilityofSubcommitteeD30.04onLaminaandLaminateTestMethods.CurrenteditionapprovedApril1,2007.PublishedApril2007.Originallyapprovedin2006.Lastpreviouseditionapprovedin2006asD7264/D7264M–06.DOI:10.1520/D7264_D7264M-07.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3AvailablefromAmericanNationalStandardsInstitute(ANSI),25W.43rdSt.,4thFloor,NewYork,NY10036,©ASTMInternational,100BarrHarbourDr.P.O.BoxC-700,WestConshohocken,Pennsylvania19428-2959,UnitedStates3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1flexuralstrength,n—themaximumstressattheoutersurfaceofaflexuretestspecimencorrespondingtothepeakappliedforcepriortoflexuralfailure.3.2.2flexuralmodulus,n—theratioofstressrangetocorrespondingstrainrangeforatestspecimenloadedinflexure.3.3Symbols:b=specimenwidthCV=samplecoefficientofvariation,inpercentEfchord=flexuralchordmodulusofelasticityEfsecant=flexuralsecantmodulusofelasticityh=specimenthicknessL=supportspanm=slopeofthesecantoftheload-deflectioncurven=numberofspecimensP=appliedforcesn-1=samplestandarddeviationxi=measuredorderivedpropertyx=samplemeand=mid-spandeflectionofthespecimen´=strainattheoutersurfaceatmid-spanofthespecimens=stressattheoutersurfaceatmid-spanofthespecimen4.SummaryofTestMethod4.1Abarofrectangularcrosssection,supportedasabeam,isdeflectedataconstantrateasfollows:4.1.1ProcedureA—Thebarrestsontwosupportsandisloadedbymeansofa