Designation:D7998−15StandardTestMethodforMeasuringtheEffectofTemperatureontheCohesiveStrengthDevelopmentofAdhesivesusingLapShearBondsunderTensileLoading1ThisstandardisissuedunderthefixeddesignationD7998;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodconcernsbondingandtestingofwoodadhesivesandrelatedadhesivesusingsmallscaletensilelap-shearsamplesinamannerthatemphasizestransientcohesivestrengthasafunctionofbondingtimeandtempera-ture.1.2Useofthinadherendsenablesbondlinestoberapidlyheatedtoelevatedtemperaturesandmaintainedatthosetemperaturesforarangeoftimesatacontrolledpressurebeforetesting.1.3Optionalrapidforcedaircoolingofbondsafterpressingandimmediatelybeforetestingenablestheeffectoftestingtemperatureontransientstrengthtobeevaluated.1.4Bondoverlapdistanceisspecifiedtoensurethatfailureoccursinthebondlineratherthaninunbondedportionsofadherendstrips,andalsotominimizetheeffectofshearstressnon-uniformityalongtheoverlapduringtensiletesting.1.5Standardwoodoralternativenon-standardmaterialsmustbeofspecifiedhighqualityanduniformityofstructureanddimensiontominimizevariabilityofbondingandmaxi-mizestresstransferintothebondsduringtesting.1.6Theeffectofwoodvariabilityandtype,orofthepropertiesofalternativenon-woodmaterials,onbondstrengthdevelopmentmaybeexploredusingthemethod.1.7Optionalhermeticsealingofbondoverlapsduringtheirheatedpressingenablestheeffectofmoistureonbondingtobeevaluated.1.8Thermaldamage,eitherofpre-formedbondsorbyprolongingbondformingtimes,maybeevaluatedasafunctionoftimeandelevatedtemperatureusingthistestmethod.1.9ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.10Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheusero...
