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1、ThisinternationalstandardwasdevelopedinaccordancewithinternationallyrecognizedprinciplesonstandardizationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecommendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT
2、)Committee.Designation:D1388−18StandardTestMethodfor1StiffnessofFabricsThisstandardisissuedundertheÞxeddesignationD1388;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindica
3、testheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.ScopeD2904PracticeforInterlaboratoryTestingofaTextileTestMethodthatProducesNormallyDis
4、tributedData(With-1.1Thistestmethodcoversthemeasurementofstiffness3drawn2008)propertiesoffabrics.BendinglengthismeasuredandßexuralD2906PracticeforStatementsonPrecisionandBiasforrigidityiscalculated.Twoproceduresareprovided.3Textiles(Withdrawn2008)1.1.1OptionACantileve
5、rTest,employingtheprincipleofD3776TestMethodsforMassPerUnitArea(Weight)ofcantileverbendingofthefabricunderitsownmass.Fabric1.1.2OptionBHeartLoopTest,employingtheprincipleD4850TerminologyRelatingtoFabricsandFabricTestofaloopformedinafabricstripandhungvertically.Methods
6、1.2Thistestmethodappliestomostfabricsincludingwovenfabrics,airbagfabrics,blankets,nappedfabrics,knitted3.Terminologyfabrics,layeredfabrics,pilefabrics.Thefabricsmaybe3.1ForallterminologyrelatingtoD13.59,FabricTestuntreated,heavilysized,coated,resin-treated,orotherwise
7、Methods,General,refertoTerminologyD4850.treated.3.1.1Thefollowingtermsarerelevanttothisstandard:1.3ThevaluesstatedinSIunitsaretoberegardedasthebendinglength,cross-machinedirection,CD,fabric,ßexuralstandard.TheU.S.customaryunitsmaybeapproximate.rigidity,machinedirectio
8、n,MD,stiffness.1.4Thisstandarddoesnotpurporttoaddressallofthe3.2Forallotherterminologyrelatedtotextiles,refertosafetyconcern
