ASTM D6272-17 Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point Bending英文版

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1、Designation:D6272−17StandardTestMethodforFlexuralPropertiesofUnreinforcedandReinforcedPlastics1andElectricalInsulatingMaterialsbyFour-PointBendingThisstandardisissuedunderthefixeddesignationD6272;thenumberimmediatelyfollowingthedesignationindicatestheyearoforig

2、inaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*span.Forthisreasonandotherdifferencesintechnicalcontent,exerc

3、iseextremecareifattemptingtocompareresultsbetweenthetwotest1.1Thistestmethodcoversthedeterminationofflexuralmethods.propertiesofunreinforcedandreinforcedplastics,includinghigh-moduluscompositesandelectricalinsulatingmaterialsin2.ReferencedDocumentstheformofrect

4、angularbarsmoldeddirectlyorcutfromsheets,2.1ASTMStandards:2plates,ormoldedshapes.ThesetestmethodsaregenerallyD618PracticeforConditioningPlasticsforTestingapplicabletorigidandsemirigidmaterials.However,flexuralD638TestMethodforTensilePropertiesofPlasticsstrength

5、cannotbedeterminedforthosematerialsthatdonotD790TestMethodsforFlexuralPropertiesofUnreinforcedbreakorthatdonotfailintheouterfibers.ThistestmethodandReinforcedPlasticsandElectricalInsulatingMateri-utilizesafourpointloadingsystemappliedtoasimplyalssupportedbeam.D

6、883TerminologyRelatingtoPlastics1.2Thistestmethoddescribestwoprocedures(ProcedureAD4000ClassificationSystemforSpecifyingPlasticMateri-andProcedureB),theselectionofwhichdependsonthealsbehaviorofthesampletobetestedasexplainedbelow:D5947TestMethodsforPhysicalDimen

7、sionsofSolid1.2.1ProcedureA,designedprincipallyformaterialsthatPlasticsSpecimensbreakatcomparativelysmalldeflections.ItshallbeusedforE4PracticesforForceVerificationofTestingMachinesmeasurementofflexuralproperties,particularlyflexuralE83PracticeforVerificationandCla

8、ssificationofExten-modulus,unlessthematerialspecificationstatesotherwise.someterSystems1.2.2ProcedureB,designedparticularlyforthosematerialsE691PracticeforConductinganInterlaboratory