【英文标准名称】:StandardTestMethodforFlexuralPropertiesofUnreinforcedandReinforcedPlasticsandElectricalInsulatingMaterialsbyFour-PointBending
【原文标准名称】:四点弯曲法测定非增强和增强塑料和电绝缘材料的挠性特性的标准试验方法
【标准号】:ASTMD6272-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:flexuralproperties;fourpointbending;plastics;stiffness;strength;Electricalinsulatingplastics;Flexuraltesting--plastics;Four-pointbending;Highmodulusfibrouscomposites;Reinforcedplastics;Stiffness--plastics;Unreinforcedplastics
【摘要】:Flexuralpropertiesdeterminedbythistestmethodareespeciallyusefulforqualitycontrolandspecificationpurposes.ThistestmethodmaybemoresuitedforthosematerialsthatdonotfailwithinthestrainlimitsimposedbyTestMethodD790.Themajordifferencebetweenfourpointandthreepointbendingmodesisthelocationofthemaximumbendingmomentandmaximumaxialfiberstress.Infourpointbendingthemaximumaxialfiberstressisuniformlydistributedbetweentheloadingnoses.Inthreepointbendingthemaximumaxialfiberstressislocatedimmediatelyundertheloadingnose.Flexuralpropertiesmayvarywithspecimendepth,temperature,atmosphericconditions,andthedifferenceinrateofstrainingspecifiedinProceduresAandB.Beforeproceedingwiththistestmethod,referenceshouldbemadetothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameterscoveredinthematerialspecification,orboth,shalltakeprecedenceoverthosementionedinthistestmethod.Iftherearenomaterialspecifications,thenthesedefaultconditionsapply.Table1inClassificationD4000liststheASTMmaterialsstandardsthatcurrentlyexist.1.1Thistestmethodcoversthedeterminationofflexuralpropertiesofunreinforcedandreinforcedplastics,includinghigh-moduluscompositesandelectricalinsulatingmaterialsintheformofrectangularbarsmoldeddirectlyorcutfromsheets,plates,ormoldedshapes.Thesetestmethodsaregenerallyapplicabletorigidandsemirigidmaterials.However,flexuralstrengthcannotbedeterminedforthosematerialsthatdonotbreakorthatdonotfailintheouterfibers.Thistestmethodutilizesafourpointloadingsystemappliedtoasimplysupportedbeam.1.2Thistestmethodmaybeusedwithtwoprocedures:1.2.1ProcedureA,designedprincipallyformaterialsthatbreakatcomparativelysmalldeflections.1.2.2ProcedureB,designedparticularlyforthosematerialsthatundergolargedeflectionsduringtesting.1.2.3ProcedureAshallbeusedformeasurementofflexuralproperties,particularlyflexuralmodulus,unlessthematerialspecificationstatesotherwise.ProcedureBmaybeusedformeasurementofflexuralstrength.1.3Comparativetestsmayberunaccordingtoeitherprocedure,providedthattheprocedureisfoundsatisfactoryforthematerialbeingtested.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesprovidedinparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThistestmethodisequivalenttoISO14125(MethodB).
【中国标准分类号】:K15
【国际标准分类号】:83_080_01
【页数】:8P.;A4
【正文语种】:英语