Designation:D1424−09(Reapproved2013)´1StandardTestMethodforTearingStrengthofFabricsbyFalling-Pendulum(Elmendorf-Type)Apparatus1ThisstandardisissuedunderthefixeddesignationD1424;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ε1NOTE—InTableA3.1,typographicalerrorsintheUseableTestRangeswerecorrectededitoriallyinJanuary2015.1.Scope1.1Thistestmethodcoversthedeterminationoftheforcerequiredtopropagateasingle-riptearstartingfromacutinafabricandusingafalling-pendulum(Elmendorf-Type)appa-ratus.1.2Thistestmethodappliestomostfabricsincludingwoven,layeredblankets,nappedpile,blanket,andairbagfabrics,providedthefabricdoesnottearinthedirectioncrosswisetothedirectionoftheforceapplicationduringthetest.Thefabricsmaybeuntreated,heavilysized,coated,resin-treated,orotherwisetreated.Instructionsareprovidedfortestingspecimenswith,orwithout,wetting.1.3Thistestmethodissuitableonlyforthewarpdirectiontestsofwarp-knitfabrics.Itisnotsuitedforthecoursedirectionofwarpknitfabricsoreitherdirectionofmostotherknittedfabrics.1.4ThevaluesstatedineitherSIunitsorU.S.customaryunitsaretoberegardedasstandard,butmustbeusedindependentlyofeachother.TheU.S.customaryunitsmaybeapproximate.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD629TestMethodsforQuantitativeAnalysisofTextilesD1776PracticeforConditioningandTestingTextilesD2261TestMethodforTearingStrengthofFabricsbytheTongue(SingleRip)Procedure(Constant-Rate-of-ExtensionTensileTestingMachine)D2904PracticeforInterl...
