碳化硅增强钛合金基复合材料热残余应力的有限元分析  

Finite element analysis on thermal residual stress of titanium alloy matrix composite reinforced by silicon carbide

作　　者：时光辉[1] 杨庆生[1] 张蕾[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《计算机辅助工程》2012年第4期32-35,共4页Computer Aided Engineering

基　　金：国家自然科学基金(10872011;11172012);北京市自然科学基金(3092006);教育部博士点基金(20101103110005)

摘　　要：为探寻热解碳层对涂碳SiC纤维增强Ti-15-3钛合金基复合材料(C-SiC/Ti-15-3)中热残余应力的影响,基于复合材料细观力学方法,建立在不同热解碳层厚度时C-SiC/Ti-15-3复合材料的有限元单胞模型,模拟复合材料中热残余应力的分布.研究发现,在SiC纤维表面增加碳涂层能明显降低复合材料中的热残余应力,SiC表面的热解碳层厚度对复合材料中的热残余应力有很大影响;随着热解碳层厚度的增加,最大von Mises等效应力和径向应力呈现先减小后增大的趋势.To explore the influence of pyrolytic carbon layer on thermal residual stress of titanium （Ti-15- 3） alloy matrix composite reinforced by fibre SiC coated carbon（C-SiC/Ti-15-3）, based on composite mesomechanics method, the finite element unit cell models of composite C-SiC/Ti-15-3 with different thicknesses of pyrolytic carbon layer are built to simulate thermal residual stress distribution. It shows that the thermal residual stress of the composite can be reduced obviously by coating the fibre SiC with carbon, and the thickness of pyrolytic carbon layer coated SiC has great influence on the thermal residual stress of the composite. Along with the increase of the pyrolytic carbon layer thickness, the maximum yon Mises equivalent stresses and radial stresses are decreased at first and then trend to increase.

关 键 词：复合材料 热解碳层 热残余应力 界面层 有限元 

分 类 号：TB332[一般工业技术—材料科学与工程]