ASTMDL77494075951~0055b593638({TbDesignation:D1774-94AMERICANSOCIENFORTESTINGANDMATERIALS1916RaceSt.Philadelphia,Pa19103ReprintedfromtheAnnualBookofASTMStandardsCopyrightASTMIfnotlistedinthecurrentcombinedindex,willappearinthenextediiionStandardTestMethodsforElasticPropertiesofTextileFibers’ThisstandardisissuedunderthefixeddesignationD1774;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.iThesetestmethodscovermeasurementoftheelasticbehavioroffibersbyassessingtheirabilitytorecoverstrain-inducedenergy,andtorecovertheiroriginaldimen-sionsfollowingaknownextension.Sincethecrimpinafiberalterstheinitialshapeofthestress-straincurve,separateproceduresaredescribedforuncrimpedandcrimpedfibers.NOTEI-Forthedeterminationoftheelasticpropertiesofelastomericyarns,refertoTestMethodD273I,TestMethodforElasticPropertiesofElastomericYams(Constant-Rate-of-ExtensionMa-chines).21.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.iASTMSíandards:D76SpecificationforTensileTestingMachinesforD123TerminologyRelatingtoTextiles’D1776PracticeforConditioningTextilesforTesting’D2258PracticeforSamplingYarnforTesting’D3333PracticeforSamplingMan-MadeStapleFibers,D4848TerminologyofForce,DeformationandRelatedTextiles2Sliver,orTowforTesting3PropertiesofTextiles33.Terminology3.1DeJinitions:3.1.1dt.formation,permanent,n-thenetlong-termchangeinadimensionofaspecimenafterdeformationandrelaxationunderspecifiedconditions.(Syn.permanentset,nonrecoverabledeformation,andnonrecoverablestretch.3.I.1.IDiscussion-Permanentdeformationisusuallyexpressedasapercentageoftheoriginaldimension.3.1.2e...
