ASTM D7248/D7248M-2008 承受/旁通用2种紧固样品的聚合物基质复合叠层碾压的交感响应的标准试验方法

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【英文标准名称】:StandardTestMethodforBearing/BypassInteractionResponseofPolymerMatrixCompositeLaminatesUsing2-FastenerSpecimens
【原文标准名称】:承受/旁通用2种紧固样品的聚合物基质复合叠层碾压的交感响应的标准试验方法
【标准号】:ASTMD7248/D7248M-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D30.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bearing/bypassproperties;bearingstrength;bypassstrength;compositematerials;Laminates(aerospace);Polymers(composites)
【摘要】:Thistestmethodisdesignedtoproducebearing/bypassinteractionresponsedataforresearchanddevelopment,andforstructuraldesignandanalysis.Thestandardconfigurationforeachprocedureisveryspecificandisintendedasabaselineconfigurationfordevelopingstructuraldesigndata.ProcedureA,thebypass/highbearingdouble-shearconfigurationisrecommendedfordevelopingdataforspecificapplicationswhichinvolvedoubleshearjoints.ProcedureB,thebypass/highbearingsingle-shearconfigurationismoreusefulintheevaluationoftypicaljointconfigurations.Thespecimenmaybetestedineitheranunstabilized(nosupportfixture)orstabilizedconfiguration.Theunstabilizedconfigurationisintendedfortensileloadingandthestabilizedconfigurationisintendedforcompressiveloading.Theseconfigurations,particularlythestabilizedconfiguration,havebeenextensivelyusedinthedevelopmentofdesignallowablesdata.Thevariantsofeitherprocedureprovideflexibilityintheconductofthetest,allowingadaptationofthetestsetuptoaspecificapplication.However,theflexibilityoftestparametersallowedbythevariantsmakesmeaningfulcomparisonbetweendatasetsdifficultifthedatasetswerenottestedusingidenticaltestparameters.ProcedureC,thebypass/lowbearingdouble-shearhardpointconfigurationisrecommendedfordeterminingtheeffectoflowbearingstresslevelsonbypassstrength.Whileasimilarsingle-shearconfigurationcouldbetested,thereisinsufficientexperiencewithasingle-shearconfigurationtorecommenditsuseatthistime.Generalfactorsthatinfluencethemechanicalresponseofcompositelaminatesandshouldthereforebereportedincludethefollowing:material,methodsofmaterialpreparationandlay-up,specimenstackingsequence,specimenpreparation,specimenconditioning,environmentoftesting,specimenalignmentandgripping,speedoftesting,timeheldattesttemperature,voidcontent,andvolumepercentreinforcement.Specificfactorsthatinfluencethebearing/bypassinteractionresponseofcompositelaminatesandshouldthereforebereportedincludenotonlytheloadingmethod(eitherProcedureAorB)andloadingtype(tensionorcompression)butthefollowing(forbothprocedures):edgedistanceratio,widthtodiameterratio,diametertothicknessratio,fastenertorque,fastenerorpinmaterial,fastenerorpinclearance;and(forProcedureBonly)countersinkangleanddepthofcountersink,typeofgrommet(ifused),typeofmatingmaterial,andtypeofsupportfixture(ifused).Properties,inthetestdirection,whichmaybeobtainedfromthistestmethodincludethefollowing:Filledholetensilebearing/bypassstrength.Filledholecompressivebearing/bypassstrength.Bearingstress/bypassstraincurve.1.1Thistestmethoddeterminestheuniaxialbearing/bypassinteractionresponseofmulti-directionalpolymermatrixcompositelaminatesreinforcedbyhigh-modulusfibersbyeitherdouble-sheartensileloading(ProceduresAandC)orsingle-sheartensileorcompressiveloading(ProcedureB)ofatwo-fastenerspecimen.Thescopeofthistestmethodislimitedtonetsection(bypass)failuremodes.Standardspecimenconfigurationsusingfixedvaluesoftestparametersaredescribedforeachprocedure.Anumberoftestparametersmaybevariedwithinthescopeofthestandard,providedthattheparametersarefullydocumentedinthetestreport.Thecompositematerialformsarelimitedtocontinuous-fiberordiscontinuous-fiber(tapeorfabric,orboth)reinforcedcompositesforwhichthelaminateisbalancedandsymmetricwithrespecttothetestdirection.Therangeofacceptabletest......
【中国标准分类号】:G31
【国际标准分类号】:59_100_01
【页数】:30P.;A4
【正文语种】:英语