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1、复合材料学报第28卷第1期2月2011年ActaMateriaeCompositaeSinicaVol28No1February2011文章编号:1000-3851(2011)01-0166-06碳纳米管增强镁基复合材料热残余应力的有限元分析*1,211,21李维学,张胡军,戴剑锋,王青(1.兰州理工大学理学院,兰州730050;2.兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州730050)摘要:为了探寻Ni层厚度对镀镍碳纳米管增强AZ91D镁基复合材料(Ni-CNTs/AZ9
2、1D)中热残余应力的影响,在实验基础上,建立不同Ni层厚度时Ni-CNTs/AZ91D复合材料的有限元模型,模拟了Ni-CNTs/AZ91D复合材料中热残余应力的分布。研究发现:在碳纳米管表面镀镍能够明显降低Ni-CNTs/AZ91D复合材料中的热残余应力。Ni-CNTs/AZ91D复合材料中,热残余应力在Ni层厚度为6nm时最小;Ni层厚度由2nm增至6nm时,热残余应力随着Ni层厚度的增加而减小;当Ni层厚度超过6nm时热残余应力随着Ni层厚度的增加而增大。复合材料中热残余应力的最大值随碳纳米管表面Ni层厚
3、度的增加向Ni层与基体的界面移动。关键词:热残余应力;碳纳米管;镁基复合材料;镍层厚度;有限元中图分类号:TB332;O346.1文献标志码:AFiniteelementanalysisofthermalresidualstressesinmagnesiummatrixcompositereinforcedbycarbonnanotubes*1,211,21LIWeixue,ZHANGHujun,DAIJianfeng,WANGQing(1.SchoolofScience,LanzhouUniver
4、sityofTechnology,Lanzhou730050,China;2.StateKeyLaboratoryofGansuAdvancedNonferrousMetalMaterials,LanzhouUniversityofTechnology,Lanzhou730050,China)Abstract:InordertoexploretheinfluenceofNicoatingthicknessonthethermalresidualstressinAZ91Dmagnesiummatrixcom
5、positereinforcedwithNicoatedcarbonnanotubes(Ni-CNTs/AZ91D),thedistributionofthethermalresidualstressesinNi-CNTs/AZ91Dcompositewassimulatedbyusingfiniteelementmethod(FEM)basedonsomeexperiments.TheresultsindicatethatplatingNionCNTssurfacecangreatlyreducetheth
6、ermalresidualstressofNi-CNTs/AZ91D.FortheNi-CNTs/AZ91Dcompositematerials,thethermalresidualstressachievestheminimumatthethicknessofNicoatingis6nm.WhilethethicknessofNicoatingisvaryingfrom2nmto6nm,thethermalresidualstressisdiminishedwiththeincreaseofthethic
7、knessofNicoating.OncethethicknessofNicoatingislargerthan6nm,thethermalresidualstressincreaseswithincreasingthethicknessofNicoating.Moreover,thelocationofthermalresidualstresssmaximummovestowardtheinterfaceofNicoatingandsubstratewithincreasingofthethickn
8、essofNicoating.Keywords:thermalresidualstresses;carbonnanotubes;magnesiummatrixcomposite;Nicoatingthickness;finiteelement[4]碳纳米管(CNTs)增强镁基复合材料由于其极BouchikhiAboubakarSeddik用有限元方法研究低的密度、优良的物理和力
