Measurement of Bonding Strength between Elastic/Viscoelastic and Viscoelastic/Viscoelastic Bi-material Interfaces，第六届亚欧研讨会上处理和性能增强聚合物会议文集（2013.6.2-6 武汉）-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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关键词：

interface mechanics stress singularity bonding strength of
bi-material interface viscoelasticity polymeric materials

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79K

所属学科：

分子表征

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第六届亚欧研讨会上处理和性能增强聚合物会议文集（2013.6.2-6 武汉）

简介：

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:

作者：

Z. H. Xia

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2013-06-21 16:10:56

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