【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


Product Code:SAE AS1046
Title:Minimum Standard for Portable Gaseous, Oxygen Equipment
Issuing Committee:A-10 Aircraft Oxygen Equipment Committee
Scope:This standard is intended to apply to portable compressed gaseous oxygen equipment. When properly configured, this equipment is used either for the administration of supplemental oxygen, first aid oxygen or smoke protection to one or more occupants of either private or commercial transport aircraft.