【英文标准名称】:StandardTestMethodforStrengthPropertiesofAdhesivesinShearbyTensionLoadingofSingle-Lap-JointLaminatedAssemblies
【原文标准名称】:用单面搭接迭层板组件的拉伸负荷测定剪切时胶粘剂强度特性的标准试验方法
【标准号】:ASTMD3165-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D14.80
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:胶粘剂;粘结强度;叠层板材;特性;拉伸负荷;测试
【英文主题词】:assemblies;bonds;laminated;lap-joints;shearstrength;single-lap;tension
【摘要】:Thistestmethodisusefulinthatthejointconfigurationcloselysimulatestheactualjointconfigurationofmanybondedassemblies.Surfacepreparationoftheadherendscanaffecttheapparentshearstrengthoftheadhesiveandcanbeoneofthevariablesunderstudy.Thistestmethodisalsousefulasanin-processqualitycontroltestforlaminatedassemblies.Inpracticethelaminatedassemblyiseithermadeoversizeandtestspecimensremovedfromitorapercentageoftheassembliesaredestructivelytested.Themisuseofstrengthvaluesobtainedfromthistestmethodasdesignallowablestressvaluesforstructuraljointscouldleadtoproductfailure,propertydamage,andhumaninjury.Theapparentshearstrengthofanadhesiveobtainedfromagivensmallsingle-lapspecimenmaydifferfromthatobtainedfromajointmadewithdifferentadherendsorbyadifferentbondingprocess.Thenormalvariationoftemperatureandmoistureintheserviceenvironmentcausestheadherendsandtheadhesivetoswellandshrink.Theadherendsandadhesivearelikelytohavedifferentthermalandmoisturecoefficientsofexpansion.4.3.1Eveninsmallspecimens,short-termenvironmentalchangescaninduceinternalstressesorchemicalchangesintheadhesivethatpermanentlyaffecttheapparentstrengthandothermechanicalpropertiesoftheadhesive.Theproblemofpredictingjointbehaviorinachangingenvironmentisevenmoredifficultifadifferenttypeofadherendisusedinalargerstructuraljointthanwasusedinthesmallspecimen.Theapparentshearstrengthmeasuredwithasingle-lapspecimenisnotsuitablefordeterminingdesignallowablestressesfordesigningstructuraljointsthatdifferinanymannerfromthejointstestedwithoutthoroughanalysisandunderstandingofthejointandadhesivebehaviors.Single-laptestsmaybeusedforcomparingandselectingadhesivesorbondingprocessesforsusceptibilitytofatigueandenvironmentalchanges,butsuchcomparisonsmustbemadewithgreatcautionsincedifferentadhesivesmayresponddifferentlyindifferentjoints.ReviewGuideD4896forfurtherdiscussionofconceptsforinterpretationofadhesive-bondedsingle-lapjointdata.1.1Thistestmethod(Note1)isintendedfordeterminingthecomparativeshearstrengthsofadhesivesinlargeareajointswhentestedonastandardsingle-lap-jointspecimenandunderspecifiedconditionsofpreparationandtesting.Adhesivesresponddifferentlyinsmallversuslargeareajoints(Note2).Note1Whilethistestmethodisintendedforuseinmetal-to-metalapplications,itmaybeusedformeasuringtheshearpropertiesofadhesivesusingplasticadherends,providedconsiderationisgiventothethicknessandrigidityoftheplasticadherends.Doublersorbondedtabsmayberequiredforplasticadherendstopreventbearingfailureintheadherends.Note2Thisvariationcanbeinfluencedbyadhesivedensity,flowcharacteristics,curerate,geltime,carriercomposition,entrappedvolatiles,volatilesreleasedduringcure,etc.andalsobycurecyclevariablesincluding:temperature,time,pressure,riseratetotemperature,cool-downrate,etc.Inadditiontotheprocessingvariablesjointsizechangesthelevelofconstraintontheadhesiveaswellastheinfluenceofinducedtensileloadsattheedgeofthejointduringmechanicalorthermalloading.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityof......
【中国标准分类号】:G39
【国际标准分类号】:83_180
【页数】:4P.;A4
【正文语种】: