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【英文标准名称】:StandardTestMethodforBreakingStrengthandElongationofTextileFabrics(GrabTest)
【原文标准名称】:纺织品断裂强力及伸长率标准试验方法(抓样法)
【标准号】:ASTMD5034-2009
【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】:D13.60
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:breaking-strength;elongation;fabric;nonwovenfabric;wovenfabric;Nonwoventextilefabrics;Tensileproperties/testing--textilematerials/applications;Textilefabrics(felted);Textilefabrics(general);Wettesting;Woventextilefabrics;Breaki
【摘要】:Thegrabtestprocedureinthistestmethodforthedeterminationofbreakingforceandelongationisconsideredsatisfactoryforacceptancetestingofcommercialshipmentsofmostwovenornonwoventextilefabrics,andthemodifiedgrabtestprocedureisconsideredsatisfactoryforacceptancetestingofcommercialshipmentsofmostwoventextilefabrics,sincetheprocedureshavebeenusedextensivelyinthetradeforacceptancetesting.Incaseofdisagreementarisingfromdifferencesinreportedtestvalueswhenusingthistestmethodforacceptancetestingofcommercialshipments,thepurchaserandthesuppliershouldconductcomparativeteststodetermineifthereisastatisticalbiasbetweentheirlaboratories.Competentstatisticalassistanceisrecommendedfortheinvestigationofbias.Asaminimum,thetwopartiesshouldtakeagroupoftestspecimenswhichareashomogeneousaspossibleandwhicharefromalotofmaterialofthetypeinquestion.Thetestspecimensshouldthenberandomlyassignedinequalnumberstoeachlaboratoryfortesting.TheaverageresultsfromthetwolaboratoriesshouldbecomparedusingStudent''st-testforunpaireddataandanacceptableprobabilitylevelchosenbythetwopartiesbeforetestingisbegun.Ifabiasisfound,eitheritscausemustbefoundandcorrected,orthepurchaserandthesuppliermustagreetointerpretfuturetestresultsinlightoftheknownbias.Thistestmethodisnotrecommendedforknittedfabricsbecauseoftheirhighstretch.Somemodificationoftechniquemaybenecessaryforanyfabrichavingastrengthinexcessof200-N/cm(1140-lb/in.)width.Specialprecautionarymeasuresareprovidedforusewhennecessaryforstrongfabrics.Alloftheproceduresareapplicablefortestingfabricseitherconditionedorwet.Comparisonofresultsfromtensiletestingmachinesoperatingondifferentprinciplesisnotrecommended.Whendifferenttypesofmachinesareusedforcomparisontesting,constant-time-to-breakat20x00B1;3sistheestablishedwayofproducingdata.Eventhenthedatamaydiffersignificantly.Althoughaconstant-rate-of-extensionispreferredintheseprocedures,incasesofdispute,unlessthereisagreementtothecontrarybetweenthepurchaserandthesupplier,aconstant-time-to-break(20x00B1;3s)istobeused.Thegrabtestprocedureisapplicabletothedeterminationoftheeffectivestrengthofthefabric;thatis,thestrengthoftheyarnsinaspecificwidthtogetherwiththefabricassistancefromtheadjacentyarns.Thebreakingforcedeterminedbythegrabprocedureisnotareflectionofthestrengthoftheyarnsactuallygrippedbetweenclampsandcannotbeusedfordirectcomparisonwithyarnstrengthdeterminations.Grabtestspecimensrequiremuchlesstimetopreparealthoughtheyrequiremorefabricperspecimen.Thereisnosimplerelationshipbetweengrabtestsandstriptestssincetheamountoffabricassistancedependsonthetypeoffabricandconstructionvariables.Themodifiedgrabtestprocedureisapplicabletothedeterminationofthebreakingforceoffabricswithconstructionsinwhichtheapplicationoftensilestressonraveledstripspecimensproducesfurtherunraveling.Thistestmethodisparticularlyapplicabletohigh-strengthfabrics.MetricEquivalentsin.
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Product Code:SAE AMS5223
Title:Iron-Nickel Alloy, Strip, 49Fe - 5.3Cr - 42Ni - 2.5Ti - 0.55Al, Solution Heat Treated, Cold Rolled, 10% Reduction
Issuing Committee:Ams F Corrosion Heat Resistant Alloys Committee
Scope:This specification covers an iron-nickel alloy in the form of strip.