ASTM D1922-2009 用摆锤法测定塑料薄膜与薄板抗扩展扯裂性的标准试验方法

作者:标准资料网 时间:2024-05-10 18:07:34  浏览:9337   来源:标准资料网

【英文标准名称】:StandardTestMethodforPropagationTearResistanceofPlasticFilmandThinSheetingbyPendulumMethod
【原文标准名称】:用摆锤法测定塑料薄膜与薄板抗扩展扯裂性的标准试验方法
【标准号】:ASTMD1922-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D20.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Elmendorf;nonrigidsheeting;plasticfilm;tear;thinsheeting;Elmendorfapparatus;Nonrigidplastics;Pendulumtest;Plasticsheetandfilm--tearresistance;Propagationtearresistance;Tearresistance;Thinsheeting
【摘要】:Thistestmethodisofvalueinrankingrelativetearingresistanceofvariousplasticfilmsandthinsheetingofcomparablethickness.Experiencehasshownthetesttohaveitsbestreliabilityonrelativelylessextensiblefilmsandsheeting.Variableelongationandobliquetearingeffectsonthemoreextensiblefilmsprecludeitsuseasapreciseproduction-controltoolforthesetypesofplastics.Thistestmethodshouldbeusedforspecificationacceptancetestingonlyafterithasbeendemonstratedthatthedatafortheparticularmaterialareacceptablyreproducible.Thistestmethodshouldbeusedforserviceevaluationonlyafteritsusefulnessfortheparticularapplicationhasbeendemonstratedwithanumberofdifferentfilms.Thistestmethodhasbeenwidelyusedasoneindexofthetearingresistanceofplasticfilmandthinsheetingusedinpackagingapplications.Whileitmaynotalwaysbepossibletocorrelatefilmtearingdatawithitsothermechanicalortoughnessproperties,theapparatusofthistestmethodprovidesacontrolledmeansfortearingspecimensatstrainingratesapproximatingsomeofthosefoundinactualpackagingservice.Duetoorientationduringtheirmanufacture,plasticfilmsandsheetingfrequentlyshowmarkedanisotropyintheirresistancetotearing.Thisisfurthercomplicatedbythefactthatsomefilmselongategreatlyduringtearing,evenattherelativelyrapidratesofloadingencounteredinthistestmethod.Thedegreeofthiselongationisdependentinturnonfilmorientationandtheinherentmechanicalpropertiesofthepolymerfromwhichitismade.Thesefactorsmaketearresistanceofsomefilmsreproduciblebetweensetsofspecimenstox00B1;5%ofthemeanvalue,whileothersmayshownobetterreproducibilitythanx00B1;50%.DataobtainedbythistestmethodmaysupplementthatfromTestMethodD1004,whereinthespecimenisstrainedatarateof50mm(2in.)perminute.However,specimengeometryandtestingspeedofthetwotestmethodsaredissimilar.Therateoftearinginthistestmethod,whilevaryingasafunctionofresistancetotear,isintherangefrom7.6to46m(300to1800in.)/min.Thereisnotadirect,linearrelationshipbetweentearingforceandspecimenthickness.Datafromthistestmethodareexpressedastearingforceinmillinewtons(orgrams-force,ifdesired),withspecimenthicknessalsoreported.Butsetsofdatafromspecimensofdissimilarthicknessareusuallynotcomparable.Therefore,onlydataatthesamethicknesscanbecompared.Formanymaterials,theremaybeaspecificationthatrequirestheuseofthistestmethod,butwithsomeproceduralmodificationsthattakeprecedencewhenadheringtothespecification.Therefore,itisadvisabletorefertothatmaterialspecificationbeforeusingthistestmethod.Table1ofClassificationSystemD4000liststheASTMmaterialsstandardsthatcurrentlyexist.1.1Thistestmethodcoversthedeterminationoftheaverageforcetopropagatetearingthroughaspecifiedlengthofplasticfilmornonrigidsheetingafterthetearhasbeenstarted,usinganElmendorf-typetearingtester.Twospecimensarecited,arectangulartype,andonewithaconstantradiustestinglength.Thelattershallbethepreferredorrefereespecimen.1.2Becauseof(1)difficultiesinselectinguniformlyidenticalspecimens,(2)thevaryingdegreeoforientationinsomeplasticfilms,and(3)thedifficultyfoundintestinghighlyextensibleorhighlyorientedmaterials,orboth,thereproducibilityofthetestresultsmaybevariableand,insomecases,notgoodormisleading.Provisionsaremadeinthetestmethodtoaddressob......
【中国标准分类号】:G33
【国际标准分类号】:83_140_10
【页数】:7P.;A4
【正文语种】:英语