内聚力界面单元与复合材料的界面损伤分析

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1、力学学报990314力学学报ACTAMECHANICASINICA1999年　第3期　No.3　1999内聚力界面单元与复合材料的界面损伤分析1)周储伟杨卫方岱宁摘要　推导了一种基于内聚力模型无厚的界面单元,用来模拟复合材料纤维与基体之间的界面层.研究了纤维周期分布的复合材料受横向荷载时,在界面不同的强韧性条件下其界面损伤演化的规律和对复合材料整体性质的影响.关键词　复合材料力学,界面单元,内聚力模型,损伤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万方数据file:///E

8、/qk/lxxb/lxxb99/lxxb9903/990314.htm（第1／9页）2010-3-233:48:10力学学报990314evolutionareretardedincaseofthehighinterfacetoughness.Themaximumnormaldisplacementjumpisatthepolarregionof