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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

資料大小：

79K

所屬學科：

分子表征

來源：

第六屆亞歐研討會上處理和性能增強聚合物會議文集（2013.6.2-6 武漢）

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:

作者：

Z. H. Xia

上傳時間：

2013-06-21 16:10:56

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