HB 7339-1996 滚轮
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基本信息
| 标准名称： | 滚轮 |
| 中标分类： | 航空、航天 >> 航空器与航天器制造用设备 >> 量具 |
| 发布日期： | 1996-09-13 |
| 实施日期： | 1997-01-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 16页 |
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引用标准
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所属分类： 航空 航天 航空器与航天器制造用设备 量具
下载地址: 点击此处下载
【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
【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
