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Measurement of Bonding Strength between Elastic/Viscoelastic and Viscoelastic/Viscoelastic Bi-material Interfaces  
Measurement of Bonding Strength between Elastic/Viscoelastic and Viscoelastic/Viscoelastic Bi-material Interfaces
資料類型： PDF文件
關鍵詞： Interface  mechanics  Stress  singularity  Bonding  strength  of  
bi-material  interface  Viscoelasticity  Polymeric  materials  
資料大?。?/td> 79K
所屬學科： 通用高分子材料
來源： 來源網(wǎng)絡
簡介：
Elastic/viscoelasticorviscoelastic/viscoelasticbi-materialinterfacesexistinmanypolymericmatrixcompositematerials.Bondingstrengthbetweenpolymermatrixandreinforcingphase(fibers,particulates,etc.)playsanimportantroleinoverallpropertiesofcompositesandmeasurementofinterfaceandpredictingdamageandfailureofcomposites.Inthispresentation,anewinnovativetestmethodincludingspecimendesign,testprocedureandaniterativecalculationalgorithmisdevelopedformoreaccuratedeterminationofthebondingstrengthofbi-materialinterfaces.Acylindricalspecimenoftwobulkmaterialswithasphericalinterfaceisdesigned.Througheitheranalyticalorfiniteelementnumericalanalysesitisfoundthatforagivenbi-materialinterface,thereexistsacriticalbondinganglevalueatthefreeedgeofthesphericalbi-materialinterface.Ifthebondingangleisdesignedtobelessthanthiscriticalvalue,interfacestresssingularitycanbeeliminatedwhenthespecimenisunderanycombinedtensileandtorsionalloadings.Twotypesofbi-materialinterfacesareconsideredinthisstudy:interfacebetweenelasticandviscoelasticmaterials(aluminum/epoxy),andbetweenviscoelasticandviscoelasticmaterials(epoxy/polyvinylchloride).Interfacestrengthtestsarecarriedoutwiththedesignedspecimenunderpuretensile,puretorsionalandvariouscombinationofthetensileandtorsionalloadingcases.Foreachcase9thefailureloadlevelisrecorded.Duetoeliminationofthestresssingularity,interfacenormalandshearstressdistributionsalongthesphericalinterfaceatthefailureloadlevelcanbemoreaccuratelydeterminedthroughfiniteelementviscoelasticanalysis.Andaniterativecalculationtechniqueisdevelopedtofindthebi-axialnormal-shearbondingstrengthenvelopeforeachtypeofbi-materialinterfaces.Ithasbeendeterminedthatfortheepoxy/aluminuminterfaceandfortheepoxy/polyvinylchlorideinterfaces,theirstrengthenvelopcanbeexpressedas:
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上傳時間： 2013-06-21 16:10:56
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