【英文标准名称】:StandardTestMethodforTearResistance(GravesTear)ofPlasticFilmandSheeting
【原文标准名称】:塑料薄膜和塑料薄板的抗撕裂强度
【标准号】:ASTMD1004-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:D20.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:箔;塑料薄膜;塑料;材料强度;抗撕裂强度;测试
【英文主题词】:Graves;plasticfilm;tear;tearinitiation;thinsheeting;
【摘要】:Tearresistanceofplasticfilmorsheetingisacomplexfunctionofitsultimateresistancetorupture.Thespecimengeometryandspeedoftestinginthistestmethodarecontrolledtoproducetearinginasmallareaofstressconcentrationatratesfarbelowthoseusuallyencounteredinservice.Experiencehasshownthetesttohaveitsbestreliabilityformaterialswhichdonothavebrittlefailureordonotelongategreaterthantwohundredpercentduringtesting.Thedatafromthistestmethodfurnishcomparativeinformationforrankingthetearingresistanceofplasticspecimensofsimilarcomposition.Actualuseperformanceintearingofsomeplasticsmaynotnecessarilycorrelatewithdatafromthistestmethod.Theresistancetotearofplasticfilmandsheeting,whilepartlydependentuponthickness,hasnosimplecorrelationwithspecimenthickness.Hence,tearingforcesmeasuredinnewtons[orpounds-force]cannotbenormalizedoverawiderangeofspecimenthicknesswithoutproducingmisleadingdataastotheactualtearingresistanceofthematerial.Datafromthistestmethodarecomparableonlyfromspecimens,whichvarybynomorethanx00B1;10%fromthenominaloraveragethicknessofallspecimenstested.Therefore,thetearingresistanceisexpressedinmaximumnewtons[orpounds-force]offorcetotearthespecimen.Thetearresistanceofplasticfilmmaybeaspecificationthatrequirestheuseofthistestmethod,butwithsomeproceduralmodificationsthattakeprecedencewhenadheringtothespecification.Therefore,itisadvisabletorefertothatmaterialspecificationbeforeusingthistestmethod.Table1ofClassificationSystemD4000liststheASTMmaterialsstandardsthatcurrentlyexist.1.1Thistestmethodcoversthedeterminationofthetearresistanceofflexibleplasticfilmandsheetingatverylowratesofloading,51mm[2in.]/min.andisdesignedtomeasuretheforcetoinitiatetearing.Thespecimengeometryofthistestmethodproducesastressconcentrationinasmallareaofthespecimen.Themaximumstress,usuallyfoundneartheonsetoftearing,isrecordedasthetearresistanceinnewtons[orpounds-force].Themethodisnotapplicableforfilmorsheetingmaterialwherebrittlefailuresoccurduringtestingorwheremaximumextensionisgreaterthan101.6mm[4in.].Note18212;Filmhasbeenarbitrarilydefinedassheetinghavingnominalthicknessnotgreaterthan0.25mm[0.010in.].1.2Constant-Rate-of-GripSeparationTest8212;Thistestmethodemploysaconstantrateofseparationofthegripsholdingthetestspecimen.1.2.1Specimenextensionmaybemeasuredinthistestmethodbygripseparation.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninbracketsareprovidedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note28212;ThereisnosimilarorequivalentISOstandard.
【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】: