Designation:D8131/D8131M−17´1StandardPracticeforTensilePropertiesofTaperedandSteppedJointsofPolymerMatrixCompositeLaminates1ThisstandardisissuedunderthefixeddesignationD8131/D8131M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialchangesmadeinSeptember2017.1.Scope1.1Thistestpracticedefinestheprocedurefordetermina-tionofthetensilestrengthofataperedorsteppedjointofpolymermatrixcompositematerials.Itisapplicabletosecond-arybondedorco-bondedlaminateswitheitherunidirectionalpliesorwovenfabricreinforcements.Thematerialstobebondedmaybedifferentmaterialsystems.Inthebondline,aseparateadhesivematerialmayormaynotbeused(example:adhesivesmaybeusedwithaprepregsystemormaynotbeusedwithawetlay-uprepairsystem).Therangeofacceptabletestlaminatesandthicknessesisdescribedin8.2.1.1.2ThispracticesupplementsTestMethodD3039/D3039Mfortensileloading.Severalimportanttestspecimenparameters(forexample,jointlength,plyoverlaps,stepdepth,andtaperratio)arenotmandatedbythispractice,however,theseparametersarerequiredtobespecifiedandreportedtosupportrepeatableresults.1.3Unidirectional(0°plyorientation)tapecomposites,textilecomposites,aswellasmultidirectionalcompositelaminates,canbetested.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.1.4.1Withinthetexttheinch-poundunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindepen-dentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,healthandenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstanda...
