ASTM-D2256-02

Designation:D2256–02StandardTestMethodforTensilePropertiesofYarnsbytheSingle-StrandMethod1ThisstandardisissuedunderthefixeddesignationD2256;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftensilepropertiesofmonofilament,multifilament,andspunyarns,eithersingle,plied,orcabledwiththeexceptionofyarnsthatstretchmorethan5.0%whentensionisincreasedfrom0.05to1.0cN/tex(0.5to1.0gf/tex).1.2Thistestmethodcoversthemeasurementofbreakingforceandelongationofyarnsandincludesdirectionsforthecalculationofbreakingtenacity,initialmodulus,chordmodu-lus,andbreakingtoughness.1.2.1Optionsareincludedforthetestingofspecimensin:(A)straight,(B)knotted,and(C)loopedform.1.2.2Conditionsoftestareincludedforthetestingofspecimensthatare:(1)conditionedair,(2)wet,notimmersed,(3)wet,immersed,(4)oven-dried,(5)exposedtoelevatedtemperature,or(6)exposedtolowtemperature.NOTE1—Specialmethodsfortestingyarnsmadefromspecificfibers;namely,glass,flax,hemp,ramie,andkraftpaperandforspecificproducts;namely,tirecordsandrope,havebeenpublished:TestMethodD885,andSpecificationD578.NOTE2—FordirectionscoveringthedeterminationofbreakingforceofyarnbytheskeinmethodrefertoTestMethodD1578.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D76SpecificationsforTensileTestingMachinesforTex-tiles2D123TerminologyRelatingtoTextiles2D578SpecificationforGlassFiberYarns2D885TestMethodsforTireCords,TireCordFabrics,andIndustrialFilamentYarnsMadefromManufacturedOrganic-BaseFibers2D1578TestMethodforBreakingStrengthofYarninSkeinForm2D1776PracticeforConditioningandTestingTextiles2D2258PracticeforSamplingYarnforTesting2D2904PracticeforInterlaboratoryTestingofaTextileTestMethodthatProducesNormallyDistributedData2D2906PracticeforStatementsonPrecisionandBiasforTextiles2D3822TestMethodforTensilePropertiesofSingleTextileFibers3D4848TerminologyofForce,DeformationandRelatedPropertiesofTextiles3D4849TerminologyRelatingtoYarnsandFibers3E178PracticeforDealingwithOutlyingObservations43.Terminology3.1Definitions:3.1.1RefertoTerminologyD4848fordefinitionsofthefollowingtermsusedinthisstandard:breakingforce,breakingstrength,breakingtenacity,breakingtoughness,chordmodu-lus,elongation,elongationatbreak,elongationatrupture,initialmodulus,knot-breakingforce,knotbreakingstrength,lineardensity,loopbreakingforce,loop-breakingstrength,single-strandbreakingforce,single-strandbreakingstrength,strengthandtenacity.3.1.2RefertoTerminologyD123andTerminologyD4849andfordefinitionsofothertermsusedinthisstandard.4.SummaryofTestMethod4.1Single-strandyarnspecimensarebrokenonatensiontestingmachineatapredeterminedelongationrateandthebreakingforceandtheelongationatbreakaredetermined.Elongationataspecifiedforceortheforceortenacityataspecifiedelongationmayalsobeobtained.Breakingforce,breakingtenacity,elongation,initialandchordmodulus,andbreakingtoughnessofthetestspecimen,intermsoflineardensity,maybecalculatedfrommachinescales,dials,record-ingcharts,orbyaninterfacedcomputer.4.2Thistestmethodoffersthefollowingthreephysicalconfigurationsofthespecimen:4.2.1ConfigurationA,straight.4.2.2ConfigurationB,knotted.1ThistestmethodisunderthejurisdictionofASTMCommitteeD13onTextilesandisthedirectresponsibilityofSubcommitteeD13.58onYarnTestMethods,General.CurrenteditionapprovedSept.10,2002.PublishedNovember2002.OriginallypublishedasD2256–64T.LastpreviouseditionD2256–97.2AnnualBookofASTMStandards,Vol07.01.3AnnualBookofASTMStandards,Vol07.02.4AnnualBookofASTMStandards,Vol14.02.1Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.4.2.3ConfigurationC,looped.4.3Thistestmethodalsooffersthefollowingsixconditionsoftestwithrespecttomoisturecontentofthespecimensatthetimeoftesting:4.3.1Condition1,conditionedtomoistureequilibriumfortestingwithstandardatmospherefortestingtextiles.4.3.2Condition2,wetnotimmersed.4.3.3Condition3,wetimmersed.4.3.4Condition4,oven-dried.4.3.5Condition5,hightemperature.4.3.6Condition6,lowtemperature.4.4Atestoptionisspecifiedbycombiningaspecimenconfigurationandamoisturecontentcondition,forexample,OptionA1meansastraightspecimenconditionedandtestedinastandardatmospherefortestingtextiles.4.5Unlessotherwiseindicated,thephrase“single-strandbreakingforce”isassociatedwithOptionA1.5.SignificanceandUse5.1AcceptanceTesting—OptionA1ofTestMethodD2256isconsideredsatisfactoryforacceptancetestingofcommercialshipmentsbecausethetestmethodhasbeenusedextensivelyinthetradeforacceptancetesting.However,thisstatementisnotapplicabletoknotandloopbreakingforcetests,testsonwetspecimens,testsonoven-driedspecimens,ortestsonspeci-mensexposedtoloworhightempe