Designation:D4761−13StandardTestMethodsforMechanicalPropertiesofLumberandWood-BaseStructuralMaterial1ThisstandardisissuedunderthefixeddesignationD4761;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONNumerousevaluationsofthemechanicalpropertiesofwood-basedstructuralmaterialhavebeensatisfactorilyconductedsincethelate1920s,usingTestMethodsD198.Thosemethodsarebestsuitedtoalaboratoryenvironmentandareadaptabletoavarietyofproductssuchasstress-gradedlumber,sawntimber,laminatedtimbers,wood-plywoodcompositemembers,reinforcedandprestressedtimbers.TheprocedurespresentedinthesetestmethodshavebeenderivedfromthosesetforthinTestMethodsD198.Theyareintendedprimarilyforapplicationtostress-gradedlumber,butcanbeusedforotherwood-basestructuralmaterialaswell.TheproceduresaremoreflexiblethanthoseinTestMethodsD198,makingtestinginanonlaboratoryenvironmentmorefeasible.Thusthetestmethodscanbeusedonproductionsitesforfieldtestingandqualitycontrol,aswellasinlaboratoriesforresearchapplications.KeydifferencesfromTestMethodsD198arethetestingspeed,thedeflection-measuringproceduresfortestspecimensunderload,andthedetailofdatareporting.Furthermore,thetestmethodsdonotrequirethatspecimensbeloadedtofailure.Sincethesetestmethodsallowlatitudeintestingprocedures,theproceduresusedshallbefullydocumentedinthetestreport.Itmayalsobedesirabletocorrelatetheresultsfromtestscarriedoutaccordingtothesetestmethodswithtestresultsobtainedthroughtheuseofatraditionalprocedure,suchasthatsetforthinTestMethodsD198.1.Scope1.1Thesetestmethodscoverthedeterminationofthemechanicalpropertiesofstress-gradedlumberandotherwood-basestructuralmaterial.1.2Thesetestmethodsappearinthefollowingorder:SectionBendingedge-wise6Bendingflat-wise:Centerpointloading7Thirdpointloading8Axialstrengthintension9Axialstrengthincompress...
