Measurement of Bonding Strength between Elastic/Viscoelastic and Viscoelastic/Viscoelastic Bi-material Interfaces-中国聚合物网,论文下载

Measurement of Bonding Strength between Elastic/Viscoelastic and Viscoelastic/Viscoelastic Bi-material Interfaces

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Interface mechanics Stress singularity Bonding strength of
bi-material interface Viscoelasticity Polymeric materials

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79K

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通用高分子材料

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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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2013-06-21 16:10:56

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