Designation:D3846−08(Reapproved2015)StandardTestMethodforIn-PlaneShearStrengthofReinforcedPlastics1ThisstandardisissuedunderthefixeddesignationD3846;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationofthein-planeshearstrengthofreinforcedthermosettingplasticsinflatsheetforminthicknessesrangingfrom2.54to6.60mm(0.100to0.260in.).Thisprotocolinnotforreinforcedpultrudedthermosetproducts,whichmayuseTestMethodD2344/D2344M.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothisstandard.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD695TestMethodforCompressivePropertiesofRigidPlasticsD2344/D2344MTestMethodforShort-BeamStrengthofPolymerMatrixCompositeMaterialsandTheirLaminatesE4PracticesforForceVerificationofTestingMachinesE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1Definitions:3.1.1in-planeshearstrength—theshearstrengthatruptureinwhichtheplaneoffractureislocatedalongthelongitudinalaxisofthespecimenbetweentwocentrallylocatednotchesmachinedhalfwaythroughitsthicknessonopposingfaces.4.SummaryofTestMethod4.1In-planeshearstrength,asdeterminedbythistestmethod,ismeasuredbyapplyingacompressiveloadtoanotchedspecimenofuniformwidth.ThespecimenisloadededgewiseinasupportingjigofthesamedescriptionasthatreferencedinTestMethodD695fortestingthinspecimen...
