Designation:D2719−19StandardTestMethodsforWoodStructuralPanelsinShearThrough-the-Thickness1ThisstandardisissuedunderthefixeddesignationD2719;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodsdeterminetheshearthrough-the-thicknesspropertiesofwoodstructuralpanelsassociatedwithsheardistortionofthemajoraxis.Woodstructuralpanelsinuseincludeplywood,orientedstrandboard,andcompositesofveneerandofwood-basedlayers.Threetestmethodsareincludedwhichdiffersomewhatintheirapplication:TestMethodSectionA.SmallPanelShearTest5B.LargePanelShearTest6C.Two-RailShearTest7Thechoiceoftestmethodwillbedeterminedinpartbythepurposeofthetests,characteristicsoftestmaterial,andequipmentavailability.Ingeneral,TestMethodBorCforlargespecimensispreferredwhenequipment,amountoftestmaterial,andexperimentalplanpermit.1.1.1TestMethodA:SmallPanelShearTest—Thistestmethodissuitablefortestingsmallsamplesofuniformmaterialincludinginvestigationsoftheeffectsofgraindirec-tionororientationandofmanyrawmaterialsandmanufactur-ingprocessvariableswhichinfluenceshearpropertiesuni-formlythroughoutthespecimen.Thetestmethodisunsuitedfordeterminingeffectsofgradeandmanufacturingfeaturessuchasdensityvariations,knots,andcoregapswithinthespecimen.1.1.2TestMethodB:LargePanelShearTest—Thistestmethodisregardedasgivingthemostaccuratemodulusofrigidityandisthereforerecommendedforelastictestsofmaterialstobeusedinstressanalysisstudiesofteststructures.Thistestmethodalsoyieldsexcellentshearstrengthvaluesforclearmaterial.However,inspiteofthelargesizeofthespecimen,failuresgenerallyoccuronlyinnarrowzonesattheperimeterofthetestarea.Thischaracteristic,aresultoftheheavyperimeterframing,causesthistestmethodtobegener-allyunsuitedfordetermininggradeandmanufacturingeffectssuchasdensityvariations,coregaps,andknotsth...
