Designation:D4761−19StandardTestMethodsforMechanicalPropertiesofLumberandWood-BasedStructuralMaterials1ThisstandardisissuedunderthefixeddesignationD4761;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONNumerousevaluationsofthemechanicalpropertiesofwood-basedstructuralmaterialshavebeensatisfactorilyconductedsincethelate1920s,usingTestMethodsD198.Thosemethodsarebestsuitedtoalaboratoryenvironmentandareadaptabletoavarietyofproductssuchasstress-gradedlumber,sawntimber,laminatedtimbers,wood-plywoodcompositemembers,reinforcedandpre-stressedtimbers.TheprocedurespresentedinthesetestmethodshavebeenderivedfromthosesetforthinTestMethodsD198.Theyareintendedprimarilyforapplicationtostress-gradedlumber,butcanbeusedforotherwood-basedstructuralmaterialsaswell.TheproceduresaremoreflexiblethanthoseinTestMethodsD198,makingtestinginanon-laboratoryenvironmentmorefeasible.Thusthetestmethodscanbeusedonproductionsitesforfieldtestingandqualitycontrol,aswellasinlaboratoriesforresearchapplications.KeydifferencesfromTestMethodsD198arethetestingspeed,thedeflection-measuringproceduresforspecimensunderload,andthedetailofdatareporting.Furthermore,thetestmethodsdonotrequirethatspecimensbeloadedtofailure.Sincethesetestmethodsallowlatitudeintestingprocedures,theproceduresusedshallbefullydocumentedinthetestreport.Itmayalsobedesirabletocorrelatetheresultsfromtestscarriedoutaccordingtothesetestmethodswithtestresultsobtainedusingatraditionalprocedure,suchasthatsetforthinTestMethodsD198.1.Scope1.1Thesetestmethodscoverthedeterminationofthemechanicalpropertiesofstress-gradedlumberandotherwood-basedstructuralmaterials.1.2Thesetestmethodsappearinthefollowingorder:SectionBendingedge-wise6Bendingflat-wise:Center-pointloading7Third-pointloading8Axialstrengthintension9Axialstrengthincompression...
