Designation:D1683/D1683M−22StandardTestMethodforFailureinSewnSeamsofWovenFabrics1ThisstandardisissuedunderthefixeddesignationD1683/D1683M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.INTRODUCTIONThestructuralintegrityoftextileproductsmadeofwovenfabricsisdependentonhowwellthepiecesthatarecutfromrollsoffabrichavebeenjoinedtogether.Tomeasurethisintegrityrequiresunderstandingtheinter-relationshipbetweentwodistincttestmethods.(a)ThefirstevaluationisdonebytestingfabricusingTestMethodD5034.Thisstandardisusedtomeasuretheresistanceofawovenfabrictoruptureinthewarpdirectionand,thefillingyarndirection.Thetestmethodmeasurestheforceneededtorupturethefabriccausingthedestructionofthefabricandthelossofitsstructuralintegrity.Thislossofstructuralintegritycausesyarnslippage,thatis,thedisplacementandchangeofyarnspacingcausinganirreversiblefabricfailure.(b)Beforecompletingthesecondevaluation,ananalysisanddeterminationoftheanticipatedfailuremodeneedstobecompletedbythefabricweaverortextileproductmanufacturer.Whilethefailuremodeforawovenfabrictextileproductsewnseamcandemonstratevariousanddistinctlevels,itisimperativetohaveagreementandunderstandingabouttheexpectedperformanceorservicelifeoftheenduseproduct.Istheseamengineeringusedtobuildthetextileproductintendedtoperformfora“singleincident”discardedandreplaced,oristheenduseproductdesignedandengineeredtobesubjectedtoregularcareandmaintenancetoincluderepairs?(c)Thesecondevaluationisdonebyusingthistestmethod,D1683/D1683M,totestfabricsectionsthathavebeencutandthensewntogetherusingproceduresthatselectaspecificcombinationofsewingthread,stitchtype,seamtype,andstitchdensity.Thesearetheseamengineeringvariablesthatdeterminewhichofthefollowingoutcomescanoccur:(1)thefab...
