Designation:D6077−10StandardTestMethodforTrapezoidTearingStrengthofLeather1ThisstandardisissuedunderthefixeddesignationD6077;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofthetearingloadofnonwovenfabricsbythetrapezoidmethodforleather.Thistestmethoddoesnotapplytowetblue.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1610PracticeforConditioningLeatherandLeatherProd-uctsforTestingD2813PracticeforSamplingLeatherforPhysicalandChemicalTests3.SummaryofTestMethod3.1Anoutlineofatrapezoid(seeFig.1)ismarkedonaspecimencutforthedeterminationofbreakingload,andthenonparallelsidesofthespecimenareclampedinthejawsofatensiletestingmachine.Acontinuouslyincreasingloadisappliedtothespecimeninsuchawaythatthetearpropagatesacrossthespecimenwidth.Thevalueofthebreakingloadofthespecimenisobtainedfromtheload-elongation(stress-strain)curverecordedautographically.4.SignificanceandUse4.1Thetrapezoidtearingloadisatensiontestinwhichtheteststrengthisdeterminedprimarilybytheinterlockingstructureofthefibers.Itisusefulforestimatingrelativeeaseoftearingofleather.4.2Theprocedurecanalsobeusedtodetermineifthereisanyappreciabledifferenceintherelativestrengthoftheleatherintheparallelandtheperpendiculardirectionstothebackbone.5.Apparatus5.1TensileTestingMachine,constant-rate-of-traversetype,equippedwithanautographicrecordertoregistertheappliedload.5.2Clamps,withfacesmeasuring25by75mm(1by3in.)withthelongerdimensionperpendi...
