astm d2344 d2344m-16

1、Designation:D2344D2344M–00e1StardTestMethodfShtBeamStrengthofPolymerMatrixCompositeMaterialsTheirLaminates1ThisstardisissuedunderthefixeddesignationD2344D2344Mthenumberimmediatelyfollowingthedesignationindicatestheyearof

2、iginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon(e)indicatesaneditialchangesincethelastrevisionreapproval.e1NOTE—ThetitlehasbeeneditiallycrectedinN

3、ovember2000.1.Scope1.1Thistestmethoddeterminestheshtbeamstrengthofhighmodulusfiberreinfcedcompositematerials.Thespecimenisashtbeammachinedfromacurvedaflatlaminateupto6.00mm[0.25in.]thick.Thebeamisloadedinthreepointbendin

4、g.1.2Applicationofthistestmethodislimitedtocontinuousdiscontinuousfiberreinfcedpolymermatrixcompositesfwhichtheelasticpropertiesarebalancedsymmetricwithrespecttothelongitudinalaxisofthebeam.1.3Thisstarddoesnotpurpttoaddr

5、essallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.1.4ThevaluesstatedineitherSIun

6、itsinchpoundunitsaretoberegardedseparatelyasstard.Thevaluesstatedineachsystemmaynotbeexactequivalentstherefeeachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconfmancewiththestard.

7、2.ReferencedDocuments2.1ASTMStards:D792TestMethodsfDensitySpecificGravity(RelativeDensity)ofPlasticsbyDisplacement2D883TerminologyRelatingtoPlastics2D2584TestMethodfIgnitionLossofCuredReinfcedResins3D2734TestMethodfVoidC

8、ontentofReinfcedPlastics3D3171TestMethodfFiberContentofResinMatrixCompositesbyMatrixDigestion4D3878TerminologyfHighModulusReinfcingFibersTheirComposites4D5229D5229MTestMethodfMoistureAbsptionPropertiesEquilibriumConditio

9、ningofPolymerMatrixCompositeMaterials4D5687D5687MGuidefPreparationofFlatCompositePanelswithProcessingGuidelinesfSpecimenPreparation4E4PracticesfFceVerificationofTestingMachines5E6TerminologyRelatingtoMethodsofMechanicalT

10、esting5E18TestMethodsfRockwellHardnessRockwellSuperficialHardnessofMetallicMaterials5E122PracticefChoiceofSampleSizetoEstimateaMeasureofQualityfaLotProcess6E177PracticefUseoftheTermsPrecisionBiasinASTMTestMethods6E456Ter

11、minologyRelatingtoQualityStatistics6E1309GuidefIdentificationofCompositeMaterialsinComputerizedMaterialPropertyDatabases4E1434GuidefDevelopmentofStardDataRecdsfComputerizationofMechanicalTestDatafHighModulusFiberReinfced

12、CompositeMaterials4E1471GuidefIdentificationofFibersFillersCeMaterialsinComputerizedMaterialPropertyDatabases43.Terminology3.1Definitions—TerminologyD3878definesthetermsrelatingtohighmodulusfiberstheircomposites.Terminol

13、ogyD883definestermsrelatingtoplastics.TerminologyE6definestermsrelatingtomechanicaltesting.TerminologyE456PracticeE177definetermsrelatingtostatistics.IntheeventofaconflictbetweendefinitionsTerminologyD3878shallhavepreced

14、enceovertheotherdocuments.NOTE1—Ifthetermrepresentsaphysicalquantityitsanalyticaldimensionsarestatedimmediatelyfollowingtheterm(lettersymbol)infundamentaldimensionfmusingthefollowingASTMstardsymbologyffundamentaldimensio

15、nsshownwithinsquarebrackets:[M]fmass[L]flength[T]ftime[Q]fthermodynamictemperature[nd]fnondimensionalquantities.Useofthesesymbolsisrestrictedtoanalyticaldimensionswhenusedwithsquarebracketsasthesymbolsmayhaveotherdefinit

16、ionswhenusedwithoutthebrackets.1ThistestmethodisunderthejurisdictionofASTMCommitteeD30onCompositeMaterialsisthedirectresponsibilityofSubcommitteeD30.04onLaminaLaminateTestMethods.CurrenteditionapprovedMarch102000.Publish

17、edJune2000.iginallypublishedasD2344–65T.LastpreviouseditionD2344–84(1995).2AnnualBookofASTMStardsVol08.01.3AnnualBookofASTMStardsVol08.02.4AnnualBookofASTMStardsVol15.03.5AnnualBookofASTMStardsVol03.01.6AnnualBookofASTMS

18、tardsVol14.02.1Copyright?ASTM100BarrHarbDriveWestConshohockenPA194282959UnitedStates.lagatthecrossheadrateused.Inertialagmaynotexceed1%ofthemeasuredload.TheaccuracyofthetestingmachineshallbeverifiedinaccdancewithPractice

19、sE4.7.2LoadingNoseSupptsasshowninFigs.56shallbe6.00mm(0.250in.)3.00mm(0.125in.)diametercylindersrespectivelywithahardnessof60to62HRCasspecifiedinTestMethodsE18shallhavefinelygroundsurfacesfreeofindentationburrswithallsha

20、rpedgesrelieved.7.3Micrometers—Fwidththicknessmeasurementsthemicrometersshallusea4to5mm(0.16to0.2in.)nominaldiameterballinterfaceonanirregularsurfacesuchasthebagsideofalaminateaflatanvilinterfaceonmachinededgesverysmooth

21、tooledsurfaces.Amicrometercaliperwithflatanvilfacesshallbeusedtomeasurethelengthofthespecimen.Theaccuracyoftheinstrument(s)shallbesuitablefreadingtowithin1%ofthesampledimensions.Ftypicalsectiongeometriesaninstrumentwitha

22、naccuracyof60.002mm(60.0001in.)isdesirablefthicknesswidthmeasurementwhileaninstrumentwithanaccuracyof60.1mm(60.004in.)isadequateflengthmeasurement.7.4ConditioningChamberwhenconditioningmaterialsatnonlabatyenvironmentsate

23、mperaturevaplevelcontrolledenvironmentalconditioningchamberisrequiredthatshallbecapableofmaintainingtherequiredtemperaturetowithin63C(65F)therequiredvapleveltowithin63%.Chamberconditionsshallbemonitedeitheronanautomatedc

24、ontinuousbasisonamanualbasisatregularintervals.7.5EnvironmentalTestChamberanenvironmentaltestchamberisrequiredftestenvironmentsotherthanambienttestinglabatyconditions.Thischambershallbecapableofmaintainingthetestspecimen

25、attherequiredtestenvironmentduringthemechanicaltestmethod.8.SamplingTestSpecimens8.1Sampling—Testatleastfivespecimenspertestconditionunlessvalidresultscanbegainedthroughtheuseoffewerspecimensasinthecaseofadesignedexperim

26、ent.FstatisticallysignificantdataconsulttheproceduresoutlinedinPracticeE122.Reptthemethodofsampling.8.2Geometry:8.2.1LaminateConfigurations—Bothmultidirectionalpureunidirectionallaminatescanbetestedprovidedthatthereareat

27、least10%0fibersinthespandirectionofthebeam(preferablywelldistributedthroughthethickness)thatthelaminatesarebothbalancedsymmetricwithrespecttothespandirectionofthebeam.8.2.2SpecimenConfigurations—Typicalconfigurationsfthe

28、flatcurvedspecimensareshowninFigs.14.Fspecimenthicknessesotherthanthoseshownthefollowinggeometriesarerecommended:Specimenlength=thickness36Specimenwidthb=thickness32.0NOTE2—AnalysisreptedbyLewisAdams(6)hasshownthatawidth

29、tothicknessratioofgreaterthan2.0canresultinasignificantwidthwiseshearstressvariation.8.2.2.1Fcurvedbeamspecimensitisrecommendedthatthearcshouldnotexceed30.Alsofthesespecimensthespecimenlengthisdefinedastheminimumchdlengt

30、h.8.3SpecimenPreparation—GuideD5687D5687Mprovidesrecommendedspecimenpreparationpracticesshouldbefollowedwherepractical.8.3.1LaminateFabrication—Laminatesmaybehlaidfilamentwoundtowplacedmoldedbyanysuitablelaminatingmeanss

31、uchaspressbagautoclaveresintransfermolding.8.3.2MachiningMethods—Specimenpreparationisimptantfthesespecimens.Takeprecautionswhencuttingspecimensfromtheringsplatestoavoidnotchesundercutsroughunevensurfacesdelaminationsasa

32、resultofinappropriatemachiningmethods.Obtainfinaldimensionsbywaterlubricatedprecisionsawingmillinggrinding.Theuseofdiamondtoolinghasbeenfoundtobeextremelyeffectivefmanymaterialsystems.Edgesshouldbeflatparallelwithinthesp

33、ecifiedtolerances.8.3.3Labeling—Labelthespecimenssothattheywillbedistinctfromeachothertraceablebacktotherawmaterialinamannerthatwillbothbeunaffectedbythetestmethodnotinfluencethetestmethod.9.Calibration9.1Theaccuracyofal

34、lmeasuringequipmentshallhavecertifiedcalibrationsthatarecurrentatthetimeofuseoftheequipment.NOTE1—DrawinginterpretationperANSIY14.51982ANSIASMEB46.11986.NOTE2—Plyientationtolerance60.5relativeto–B–.FIG.2FlatSpecimenConfi