基于数值模拟的弹性—蠕变双材料界面应力分析

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1、扼拨度2009，31(3)：497—502●研究简报●基于数值模拟的弹性一蠕变双材料界面应力分析S，I1RE：sSANAIYSIsAT11}I唧RFACEOFELASTIC—CREEPBI—MATERIAIBASEDoNNIJM哐(Sn仉JIA耵oN陈清琦轩福贞涂善东(华东理工大学机械与动力工程学院，上海200237)CHENQingQiXUANFuZhen-I'LlShanDong(3chadofMechanicalandPowerEngineering，EastChinaUniversityofScienceandTec

2、hnology，Shanghai200237，China)摘要利用ABAQUS大型有限元程序，对比分析线弹性和蠕变两种情况下Silicon／epoxy弹性一蠕变双材料界面应力分布问题。分析结果表明，界面边缘处存在严重的剪应力和剥离应力集中；边缘对齐结构的界面剪应力和剥离应力集中要小于边缘不对齐的情况；随着基体厚度增大，界面剪应力和剥离应力均减小；当基体与薄膜的厚度比增大到临界值时，剥离应力将反向，此时剥离应力的绝对值随着厚度比的增大而增大；蠕变会导致界面边缘附近剪应力和剥离应力松弛，且薄膜的蠕变指数和系数越大，蠕变松弛效应越

3、明显，随时间增大，边缘附近界面上的应力逐渐趋近于零。关键词双材料结构蠕变界面应力有限元中图分类号0346TBI31TB43AbstractByusingthegeneralfiniteelementprogramofABAQUS，acomprehensivestressanalysisatinterfaceofSilicon／epoxyelastic—creepbi—materialisperformedundertheconditionsofelasticandcreep．Resultsindicatedthatthein

4、terfacialshearandpeelingstressesarehighlyconcentratedReal"theedgeofstructures．Thestressconcentrationneartheedge0fFE(finiteelement)modelisclearlyafectedbythegeometricalshapeandsize．Ontheonehand，thestressconcentrationofalignededgeislowerthanthatoftheno-alignededge．On

5、theotherhand，thestrainmisnmtchbetweenthefilmandsubstrateisrelatedtothethicknessofsubstrate．Withtheincreasingthicknessofsubstrate，theinterfacialshearandpeelingstressesdecreases．Whentheratioofthicknesleachesthecriticalvalue，thedi—rectionofpeelingstresswilreverseandth

6、enitsabsolutevalueincreaseswiththeincreasingratioof~cknes．Underthecreepcondi—tion，thevalueofinterfacialshearandpeelstressesneartheedgeofstructurewillreduceduetotherelaxation．Moreover，decreaseofstresswillenlargewiththeincreasingcreepexponentandcreepcoeficientoffilm．

7、Consequently，thestresconcentrationnearthee(1geofs~ctulewillvanishwiththecreepingtimeextension．KeywordsBi—nmterialstrucl~re；Creep：lnterfacialsn℃；FinitedementmethodCorfeq~omJ&gr：XUANFuZhen，E-mail：豇姗@ecust．edu．cn，Tel：+86—21—64253513，Fax：+86-21一~25M25Theplejectsupporte

8、dbytheNationalNaturalScienceFoundationofChina(No．50505012)，andShanghaiRising-StarProgram(No．05QMX1416)，andFokYingTungEducationFoundation(No．10105