基本信息
| 标准名称： | 医用呼吸机 基本安全和主要性能专用要求 第5部分：气动急救复苏器 |
| 发布部门： | 国家食品药品监督管理局 |
| 发布日期： | 2011-12-31 |
| 实施日期： | 2013-06-01 |
| 首发日期： | |
| 作废日期： | |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2013-06-01 |
适用范围
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前言
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目录
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引用标准
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所属分类： 能源 核技术 能源 核技术综合 技术管理 能源和热传导工程 能源和热传导工程综合
【英文标准名称】:StandardTestMethodforTearingStrengthofFabricsbyTrapezoidProcedure
【原文标准名称】:用梯形工艺法测定织物撕裂强度的标准试验方法
【标准号】:ASTMD5587-2008
【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】:D13.60
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:fabric;tearingstrength;trapezoid;Constantrate-of-extension(CRE)test;Performance--textiles;Teartesting--textilematerials/applications;Trapezoidtearingtest;Woventextilefabrics
【摘要】:Thistestmethodisconsideredsatisfactoryforacceptancetestingofcommercialshipmentsbecausecurrentestimatesofbetween-laboratoryprecisionareacceptable,andthistestmethodisusedextensivelyinthetradeforacceptancetesting.Iftherearedifferencesofpracticalsignificancebetweentestresultsfortwolaboratories(ormore),comparativetestshouldbeperformedtodetermineifthereisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,usethesamplesforsuchacomparativetestthatareashomogeneousaspossible,drawnfromthesamelotofmaterialasthesamplesthatresultedindisparateresultsduringinitialtesting.Randomlyassignthesamplesinequalnumberstoeachlaboratory.Thetestresultsfromthelaboratoriesinvolvedshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortothetestingseries.Ifbiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsforthatmaterialmustbeadjustedinconsiderationoftheknownbias.Thetrapezoidtearproducestensionalongareasonablydefinedcoursesuchthatthetearpropagatesacrossthewidthofthespecimen.Itisusefulforestimatingtherelativetearresistanceofdifferentfabricsordifferentdirectionsinthesamefabric.Dependingonthenatureofthespecimen,thedatarecordingdeviceswillshowthetearingforceintheformofapeakorpeaks.Thehighestpeaksappeartoreflectthestrengthoftheyarncomponents,individuallyorincombination,neededtostopatearinfabricsofthesameconstruction.Thevalleysrecordedbetweenthepeakshavenospecificsignificance.Theminimumtearingforce,however,isindicatedtobeabovethelowestvalleys.Mosttextilefabricscanbetestedbythistestmethod.Somemodificationofclampingtechniquesmaybenecessaryforagivenfabric,dependinguponitsstructure.Strongfabricsorfabricsmadefromglassfibersrequirespecialadaptationtopreventthemfromslippingintheclampsorbeingdamagedasaresultofbeinggrippedintheclamps.TheCRE-typeisthepreferredtensiletestingmachine.ThistestmethodallowstheuseoftheCRT-typetensilemachinewhenagreeduponbetweenthepurchaserandthesupplier.Theremaybenooverallcorrelation,however,betweentheresultsobtainedwiththeCRT-typemachineandtheCRE-typemachine.Consequently,thesetwotensiletesterscannotbeusedinterchangeablyunlessthedegreeofquantitativecorrelationhasbeenestablishedbetweenthepurchaserandthesupplier.Inanyevent,theCRE-typemachineshallprevail.1.1Thistestmethodcoversthemeasurementofthetearingstrengthoftextilefabricsbythetrapezoidprocedureusingarecordingconstant-rate-of-extension-type(CRE)tensiletestingmachine.1.1.1TheCRE-typetensiletestingmachinehasbecomethepreferredtestapparatusfordeterminingtrapezoidtearingstrength.Itisrecognizedthatsomeconstant-rate-of-traverse-type(CRT)tensiletestingmachinescontinuetobeused.Consequently,thesetestinstrumentsmaybeusedwhenagreeduponbetweenthepurchaserandthesupplier.TheconditionsforuseoftheCRT-typetensiletesterareincludedinAppendixX1.1.2Thistestmethodappliestomostfabricsincludingwovenfabrics,airbagfabrics,blankets,nappedfabrics,knittedfabrics,layeredfabrics,andpilefabrics.Thefabricsmaybeuntreated,heavilysized,coated,resin-treated,orotherwisetreated.Instructionsareprovidedfortestingspecimenswithorwithoutwetting.1.3Tearingstrength,asmeasuredinthistestmethod,requiresthatthetearbeinitiatedbeforetesting.Thereportedvalueobtainedisnotdirectlyrelatedtotheforcerequiredtoinitiateorstartatear.1.4Twocalculationsfortrapezoidtearings......
【中国标准分类号】:W55
【国际标准分类号】:59_080_30
【页数】:6P.;A4
【正文语种】:英语