Designation:D2718−00(Reapproved2011)StandardTestMethodsforStructuralPanelsinPlanarShear(RollingShear)1ThisstandardisissuedunderthefixeddesignationD2718;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodsdeterminetheshearpropertiesofstructuralpanelsassociatedwithsheardistortionoftheplanesparalleltotheedgeplanesofthepanels.Bothshearstrengthandmodulusofrigiditymaybedetermined.Primarily,thetestsmeasuretheplanarshear(rollingshear)strengthdevelopedintheplaneofthepanel.1.2Structuralpanelsinuseincludeplywood,waferboard,orientedstrandboard,andcompositesofveneerandofwood-basedlayers.1.3Twotestmethodsareincluded:1.3.1TestMethodA—Planarshearloadedbyplates.1.3.2TestMethodB—Planarshearinducedbyfive-pointbending.1.3.3Thechoiceofmethodwillbedictatedbythepurposeofthetestandequipmentavailable.1.3.4TestMethodA,PlanarShearLoadedbyPlates—Thistestmethodusesarectangularpanelsectionadheredbetweensteelplateswithprotrudingknifeedgestocreateloadatthepanelfaces.Thistestmethodhasbeenusedtodevelopshearpropertiesofplywoodandorientedstrandboardforthepurposeofconfirmingdesignvalues.Thistestmethoddoesnotproducepureshear,butthespecimenlengthisprescribedsothatthesecondarystresseshaveaminimumeffect.Themethoddeterminesshearstrengthandmodulusofrigidity.1.3.5TestMethodB,PlanarShearInducedbyFive-PointBending—Planarshearstressisinducedonthepanelwhileloadedinbendingusingtwocontinuousspans.Thistestmethoddeterminesplanarshearstrengthconsistentwithpanelapplicationsundertransverseloading.Thistestmethodisabletodetermineshearstrengthatanymoisturecondition.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitat...
