【英文标准名称】:StandardTestMethodforTrapezoidTearingStrengthofGeotextiles
【原文标准名称】:土工布梯形法撕破强力的标准试验方法
【标准号】:ASTMD4533-2004(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:D35.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Destructivetesting--soil/rock;Felt;Geosynthetics;Strength--geosynthetics;Teartesting--geosyntheticmaterials/applications;Tensileproperties/testing--geosynthetics;Trapezoidtearingtest
【摘要】:Thetrapezoidtearmethodisatestthatproducestensionalongareasonablydefinedcoursesuchthatthetearpropagatesacrossthewidthofthespecimen.Thetrapezoidtearingstrengthforwovenfabricsisdeterminedprimarilybythepropertiesoftheyarnsthataregrippedintheclamps.Innonwovenfabrics,becausetheindividualfibersaremoreorlessrandomlyorientedandcapableofsomereorientationinthedirectionoftheappliedload,themaximumtrapezoidtearingstrengthisreachedwhentheresistancetofurtherreorientationisgreaterthantheforcerequiredtoruptureoneormorefiberssimultaneously.Thetrapezoidtearingstrengthmethodisusefulforestimatingtherelativetearresistanceofdifferentfabricsordifferentdirectionsinthesamefabric.Thistestmethodmaybeusedforacceptancetestingofcommercialshipments;however,cautionisadvisedsinceinformationaboutbetween-laboratoryprecisionisincomplete.Comparativetestsasdirectedin5.3.1maybeadvisable.Incaseofadisputearisingfromdifferencesinreportedtestresultswhenusingthistestmethodforacceptancetestingofcommercialshipments,thepurchaserandthesuppliershouldconductcomparativeteststodetermineifthereisastatisticalbiasbetweentheirlaboratories.Competentstatisticalassistanceisrecommendedfortheinvestigationofbias.Asaminimum,thetwopartiesshouldtakeagroupoftestspecimensthatareashomogeneousaspossibleandthatarefromalotofmaterialofthetypeinquestion.Testspecimensshouldthenberandomlyassignedinequalnumberstoeachlaboratoryfortesting.TheaverageresultsfromthetwolaboratoriesshouldbecomparedusingtheappropriateStudent''st-testandanacceptableprobabilitylevelchosenbythetwopartiesbeforetestingisbegun.Ifabiasisfound,eitheritscausemustbefoundandcorrectedorthepurchaserandthesuppliermustagreetointerpretfuturetestresultsinthelightoftheknownbias.Mostgeotextilefabricscanbetestedbythistestmethod.Somemodificationofclampingtechniquesmaybenecessaryforagivenfabric,dependinguponitsstructure.Specialadaptationmaybenecessarywithstrongfabrics,orfabricsmadefromglassfibers,topreventthemfromslippingintheclampsorbeingdamagedasaresultofbeinggrippedintheclamps.Thistestmethodmaybeusedwithconstant-rate-of-traverse(CRT)orconstant-rate-of-extension(CRE)typetensionmachines.However,theremaybenooverallcorrelationbetweentheresultsobtainedwiththeCRTmachineandtheCREmachine.Consequently,thesetwotensiontesterscannotbeusedinterchangeably.Incaseofcontroversy,theCREmachineshallprevail.1.1Thistestmethodisanindextestusedtomeasuretheforcerequiredtocontinueorpropagateatearinwovenornon-wovengeotextilesbythetrapezoidmethod.Whileusefulforqualitycontrolandacceptancetesting,thetrapezoidteartestdoesnotprovidealltheinformationneededforalldesignapplicationsandothertestmethodsshouldbeused.1.2Thistestmethodisapplicabletomostgeotextilesthatincludewovenfabrics,nonwovenfabrics,layeredfabrics,knitfabrics,andfeltsthatareusedforgeotextileapplications.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W59
【国际标准分类号】:59_080_70
【页数】:4P.;A4
【正文语种】:英语