Designation:F734−95(Reapproved2011)StandardTestMethodforShearStrengthofFusionBondedPolycarbonateAerospaceGlazingMaterial1ThisstandardisissuedunderthefixeddesignationF734;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethoddeterminestheshearyieldstrengthFsyandshearultimatestrengthFsuoffusionbondsinpolycarbon-atebyapplyingtorsionalshearloadstothefusion-bondline.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTesting3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1fusionbond,n—thebondingoftwopiecesofthesamematerialusingheatandpressure.3.1.2shear,n—internalforcetangentialtothesectiononwhichitacts.3.1.3shearstrength,n—themaximumallowablestressinabodyresultingfromforceswhichtendtocausetwocontiguouspartsofthebodytosliderelativetoeachotherinadirectionparalleltotheirplaneofcontact.3.1.4torsionalshearfixture,n—adeviceusedtoapplyashearforceinthecircularsectionofthetestspecimentoproduceaperipherallyuniformstressdistribution.4.SummaryofTestMethod4.1Testspecimensarepreparedwithafusionbondatthecenterofapolycarbonatelaminatejoinedtotwometaltestblocks.Atwistingactionisappliedtooneblockandtheloadrequiredtofracturethefusionbondistransformedintothetorsionalshearstrengthofthefusionbond.5.SignificanceandUse5.1Atthiswriting,aerospacequalityextrudedtransparentpolycarbonatematerialisnotavailableinthicknessesgreaterthan0.5in.(12.7mm).Whenarequirementexistsforsheetsthickerthan0.5in.(12.7mm),twoormoresheetsarefusionbondedtogethertoformasinglesheetofthedesiredthickness.5.2Thestructur...
