Designation:D3499−11StandardTestMethodforToughnessofWood-BasedStructuralPanels1ThisstandardisissuedunderthefixeddesignationD3499;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmethodfortoughnessofwood-basedstructuralpanelscoversthedeterminationofenergynecessarytocausefailurebyimpactloadingofabeamspecimenwhichissimplysupportedandloadedatmidspan.Wood-basedstructuralpan-elsinuseincludeplywood,waferboard,orientedstrandboard,andcompositesofveneerandofwood-basedlayers.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D143TestMethodsforSmallClearSpecimensofTimberD2395TestMethodsforSpecificGravityofWoodandWood-BasedMaterialsD4442TestMethodsforDirectMoistureContentMeasure-mentofWoodandWood-BaseMaterials3.SignificanceandUse3.1Thefailureofwood-basedmaterialswithimpactloadsissometimesanimportantcriteriaindesignconsiderations.Inaddition,someeffectsonthemechanicalpropertiesofwood,suchasdecay,arebestevaluatedbymeasuringitstoughness.ThistestmethodservestoevaluatethetoughnessofstructuralpanelproductswhileMethodsD143canbeusedtomeasurethetoughnessofsolidclearwoodspecimens.4.Apparatus4.1Thetoughnesstestingmachine(Note1)shallconsistofaframesupportingapendulum,beingsoarrangedthatameasuredamountoftheenergyfromthefallofthependulummaybeappliedtoatestspecimen.Thependulumshallconsistofabarto...
