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【英文标准名称】:StandardTestMethodsforEstablishingAllowableMechanicalPropertiesofWood-BondingAdhesivesforDesignofStructuralJoints
【原文标准名称】:确定结构连接设计用木材胶粘剂允许机械性能的标准试验方法
【标准号】:ASTMD5574-1994(2005)
【标准状态】:现行
【国别】:
【发布日期】:1994
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D14.70
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:剪应力;蠕变;结构分析;允许的机械性能;连接用胶粘剂;确定允许机械性能;对粒料的垂直拉伸应力;粘合;粘合;拉伸性能;试验;试验;木材;耐久性;胶粘剂;使用;木制品;设计;机械性能
【英文主题词】:adhesive;creep;durability;shearmodulus;shearstrength;shearstress;tensilestrength;tensionstress
【摘要】:Safeandreliablemechanicalpropertiesforadhesivesarenecessarytoachievethefullstructuralbenefitofadhesivesinbondedstructuralcomponentsandassemblies.Anadhesiversquo;propertiesexhibitanaturalvariationordistributionofvalues.Theallowabledesignstressforanadhesivemustbeadjustedtoallowforvariabilityandenvironmentaleffectstoensurehumansafetyandpreventprematurefailureofcostlystructures.Modificationfactorscanbeappliedtotheallowabledesignstressbythedesignengineerasdeemedappropriatefortheexpectedserviceconditionsoftheadhesive,orinaccordancewiththerequirementsofabuildingcode.Theallowablepropertiesdevelopedunderthesemethodsapplyonlytotheactualadhesiveformulationtestedandanalyzed.Theallowablepropertiesdevelopedforagivenadhesiveshallapplyonlytoadhesivebondlineswiththicknessesintherangeforwhichdataisavailable.1.1Thesetestmethodscovertheprinciplesforestablishingallowablemechanicalpropertiesforadhesivesthatcanbeusedtodesignadhesive-bondedjointsforstructuralcomponentsandassembliesofwoodorwoodwithothermaterials.ThesetestmethodsaremodeledafterTestMethodD245.1.2Thepropertiesdeterminedareallowableshearstress,allowabletensilestress,andallowableshearmodulus.1.3Indeterminationofallowableshear-andtensile-stresslevels,thesetestmethodsarelimitedbythehorizontalshearandtensionperpendicular-to-the-graincapacityofthewoodadherends(hardmaple,Acersaccharum,Marsh.).Theadhesivessotestedmayactuallyhaveshearortensileallowablestressesexceedingthewood,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.1.6.1Ifthesubjectadhesiveswillbeusedtobondwoodthathasbeentreatedwithapreservative,fireretardant,oranyotherchemicaltomodifyitsproperties,thenthepermanenceoftheadhesiveshallbetestedusingwoodadherendstreatedinthesamemanner.1.7Factorsfordurability,permanence,andcreepderivedbysheartestsandanalysis,areassumedtoapplytotension(normal-to-the-bond)strengthaswell.1.8Requirementsforproduction,inspection,andcertificationofadhesivesevaluatedunderthesetestmethodsarenotincluded.1.9Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinfomrationonlyandarenotconsideredstandard.
【中国标准分类号】:G38
【国际标准分类号】:83_180
【页数】:10P.;A4
【正文语种】: