Designation:D5574−94(Reapproved2021)StandardTestMethodsforEstablishingAllowableMechanicalPropertiesofWood-BondingAdhesivesforDesignofStructuralJoints1ThisstandardisissuedunderthefixeddesignationD5574;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscovertheprinciplesforestablishingallowablemechanicalpropertiesforadhesivesthatcanbeusedtodesignadhesive-bondedjointsforstructuralcomponentsandassembliesofwoodorwoodwithothermaterials.ThesetestmethodsaremodeledafterPracticeD245.1.2Thepropertiesdeterminedareallowableshearstress,allowabletensilestress,andallowableshearmodulus.1.3Indeterminationofallowableshear-andtensile-stresslevels,thesetestmethodsarelimitedbythehorizontalshearandtensionperpendicular-to-the-graincapacityofthewoodadherends(hardmaple,Acersaccharum,Marsh.).Theadhe-sivessotestedmayactuallyhaveshearortensileallowablestressesexceedingthewood,butthedeterminedallowabledesignstresslevelsarelimited(upperbounded)bythewoodinthesetestmethods.Ifawoodotherthanhardmapleisusedfortestingtheadhesive,thentheallowablestrengthsareupperboundedbythepropertiesofthatparticularwood.1.4ThestrengthpropertiesaredeterminedbystandardASTMtestmethods.Asaresult,onlyproceduralvariationsfromthestandardsandspecialdirectionsforapplyingtheresultsaregiveninthesetestmethods.1.5Time-to-failuredataderivedfromcreep-rupturetesting(seeTestMethodD4680)provideameasureoftheultimatestrengthofanadhesivebondasafunctionoftimeatvariouslevelsoftemperatureandmoisture.1.5.1Withpropercaution,usefulservicelifeatagivenshearstresslevelmaybeextrapolatedfromrelativelyshortloadingperiods.1.6Theresistanceoftheadhesivetopermanentlossofpropertiesduetoaging(permanence)isassessedbymeansofstrengthtestsafterconstantelevated-temperatureandmoistureagingoftestspecimens.1.6.1Ifthesubjectadhesivesw...
