【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


【英文标准名称】:Swivelconnectors.Generalconditionsofinterchangeability,ISOmetricthreadprofileandB.N.A.E.Tolerances.
【原文标准名称】:旋转接头(RO).互换性的通用条件、ISO米制螺纹牙形和BNAE公差
【标准号】:NFL43-310-1973
【标准状态】:现行
【国别】:法国
【发布日期】:1973-06
【实施或试行日期】:1973-06-14
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:飞行器部件;通用系统;旋转连接;航空运输;尺寸;管道配件;飞行器设备;规范;建筑物服务设施;旋转管接头;管道工程系统;互换性
【英文主题词】:
【摘要】:
【中国标准分类号】:V21
【国际标准分类号】:49_080
【页数】:2P;A4
【正文语种】:其他