ASTM D1938-2008 用一次撕裂法测定塑料薄膜与薄板的抗撕裂扩展性的标准试验方法

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【英文标准名称】:StandardTestMethodforTear-PropagationResistance(TrouserTear)ofPlasticFilmandThinSheetingbyaSingle-TearMethod
【原文标准名称】:用一次撕裂法测定塑料薄膜与薄板的抗撕裂扩展性的标准试验方法
【标准号】:ASTMD1938-2008
【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】:D20.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:plasticfilm;singletear;tear;tear-propagation;thinsheeting;trouser;Plasticsheetandfilm--tearresistance;Single-tearmethod;Tearresistance;Thinsheeting;Trousertear
【摘要】:Thistestmethodisofvalueinratingthetear-propagationresistanceofvariousplasticfilmsandthinsheetingofcomparablethickness.Forhighlyextensiblefilmorsheetingthedeformationenergyofthespecimenlegsissignificantlygreaterthanthetearingenergy.Thetear-propagationresistanceinslightlyextensibleornon-extensiblefilmorsheetingisdistinguishedfromthetear-propagationresistanceinhighlyextensiblefilmorsheetingbytheload-timeorload-displacementdata,(Fig.1andFig.2).Thetear-propagationforceforslightlyextensibleornon-extensiblematerialisdeterminedfromtheaveragetearforceversustheinitialandpeakforceforahighlyextensiblematerial.Thistestmethodshallbeusedforspecificationacceptancetestingonlyafterithasbeendemonstratedthatthedatafortheparticularmaterialareacceptablyreproducible.Thedataobtainedbythistestmethodfurnishinformationforrankingthetear-propagationresistanceofplasticfilmsandsheetingofsimilarcomposition.Actualuseperformancemaynotnecessarilycorrelatewithdatafromthistestmethod.Setsofdatafromspecimensofdissimilarthicknessareusuallynotcomparable.Beforeproceedingwiththistestmethod,referenceshouldbemadetothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredintherelevantASTMmaterialspecificationshalltakeprecedenceoverthosementionedinthistestmethod.IftherearenorelevantASTMmaterialspecifications,thenthedefaultconditionsapply.Table1ofClassificationSystemsD4000liststheASTMmaterialsstandardsthatcurrentlyexist.FIG.1Load-TimeChartforLow-ExtensibleFilmFIG.2Load-TimeChartforHighlyExtensibleFilm1.1Thistestmethodcoversthedeterminationoftheforcenecessarytopropagateatearinplasticfilmandthinsheeting(thicknessof1mm(0.04in.)orless)byasingle-tearmethod.Themethodisnotapplicableforfilmorsheetingmaterialwherebrittlefailuresoccurduringtesting.Note18212;Filmhasbeenarbitrarilydefinedassheetinghavingnominalthicknessnotgreaterthan0.25mm(0.010in.).1.2Constant-Rate-of-GripSeparationTest8212;Thistestmethodemploysaconstantrateofseparationofthegripsholdingthetestspecimen.1.2.1Specimenextensionmaybemeasuredinthistestmethodbygripseparation.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareprovidedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note28212;ThisstandardissimilartoISO6383-1,butisnotconsideredtechnicallyequivalent.ThespecimensizeforISO6383-1islarger,andthemethodspecifiesdifferenttestspeeds.
【中国标准分类号】:G33
【国际标准分类号】:83_140_10
【页数】:4P.;A4
【正文语种】:英语