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1、力學學報990314力學學報ACTAMECHANICASINICA1999年 第3期 No.3 1999內(nèi)聚力界面單元與復合材料的界面損傷分析1)周儲偉楊衛(wèi)方岱寧摘要 推導了一種基于內(nèi)聚力模型無厚的界面單元,用來模擬復合材料纖維與基體之間的界面層.研究了纖維周期分布的復合材料受橫向荷載時,在界面不同的強韌性條件下其界面損傷演化的規(guī)律和對復合材料整體性質(zhì)的影響.關(guān)鍵詞 復合材料力學,界面單元,內(nèi)聚力模型,損傷COHESIVEINTERFACEELEMENTANDINTERFACIALDAMAGEANALYSISOFCOMPOSITES1)ZhouChuweiYangWeiFangDaining(
2、DepartmentofEngineeringMechanics,TsinghuaUniversity,Beijing100084,China)AbstractAninterfaceelementbasedonthecohesivezonemodelisemployedtosimulatethefiber/matrixinterfaceincomposite.Thecohesivezonemodelusedhereisviewedasaphenomenologicalmodel.Apotentialfunctionisadoptedtodescribetherelationshipbetwee
3、ntheinterfacetractionandtheinterfacedisplacementjump.Twosetsofinterfaceparametersareadoptedtorepresenttheinterfacestrengthandtoughnessrespectively.Thismodelcansimulatetheevolutionofinterfacedamages,whicharecoupledinthenormalandtangentialdirections.Theinterfaceelementhasnothicknessinitially.Thisinter
4、facedamagemodelisperformedtocompositeswhichhaveperiodicarrayoffibersandaresubjectedtoatransverseload.Forsymmetry,thecomputationalrepresentativeelement(RVE)containsaquarteroffiber.Thefiberisassumedaselasticmaterialanditsstiffnessismuchhigherthanthatofthematrixmaterial.Thematrixisassumedasisotropichar
5、deningelastic-plasticmaterial.Finitedeformationisconsidered.Theinterfacedamageevolutionanditseffectonthepropertiesofcompositesundertheconditionsofvariousinterfacestrengthsandtoughnessisinvestigated.Theresultsshowthatthedebondingstartsatthepolarregionofthefiberandmovestotheequatorregionwiththeloading
6、increasing.TheaveragetensilestressontheRVEdropswhenthedebondingtakesplace.Largeinterfacestrengthbringsonthedelayedinterfacedebondingandthehighultimatetensilestrength.Withthesameinterfacestrength,thehighinterfacetoughnessmeansthelowinterfacestiffnessandhighenergytoseparatetheinterface.Sothedebondingi
7、nitiationand萬方數(shù)據(jù)file:///E
8、/qk/lxxb/lxxb99/lxxb9903/990314.htm（第1／9頁）2010-3-233:48:10力學學報990314evolutionareretardedincaseofthehighinterfacetoughness.Themaximumnormaldisplacementjumpisatthepolarregionof
