·60。 北京科技大学学报 1998年第1期 应力邂度 座力测度 距高 更霄 图3以三维方式输出计算结果 图4以二维方式输出计算结果 等，可由图直观地表现出了各项具体的物性参数的情况.图3和图4是热应力在FGM中的分 布情况计算结果，分别采用三维和二维方式表现，还可以打印输出.采用图形方式输出计算结 果，能够比较直观地表示应力在FGM中的分布， 3结论 (1)基于经典登层板理论和热弹性力学的有关理论，建立了一维非对称热应力缓和型 FGM分析模型.在此基础上推导出了FGM在稳态温度场下温度分布函数及热应力分布函 数.(2)在已建立的分析模型的基础上，采用Visual Basic for Windows开发出了非对称热应 力缓和型功能梯度材料计算机辅助设计系统FGMCAD,并给出了FGMCAD用于FGM设计 时的运行实例.将新的计算手段引入材料设计中，可提高效率。 参考文献 I Hirano Yamada T,Teraki J,Niino M,Kumakawa A.A Study on a Functionally Gradient Material Design System for a Trust Chamber.In:Proc 16th Int Symp on Space Tech and Sci,1988.375 2 Wakashima Otsuka M.Umekawa S.Thermal Expansions of Heterogeneous Solids Containing Aligned Ellipsoidal Inclusions.J Compos Mater,1974.(8):391 Computer Aided Design System for One Dimension Thermal Stress Relaxed Functionally Graded Materials Cao Wenbn Ge Changchun Wang Zhaoxia Li Jangtao Laboratory of Special Ceramics&Powder Metallurgy.UST Betjing.Beijing 100083,China ABSTRACT The analysis model used for calculation of thermal stress in FGM is estab- lisd based on.The classical lamination theory and thermal-elastic mechanics with five assumptions.The distributions of temperature and thermal stress in FGM under steady state temperatue field are derived.By means of FGM and combination with Visual Basic for Window.FGMCAD is established.The optimum distribution of thermal stress in FGM can be realized by any the relative parameters with FGMCAD,thus the optimum parameters of FGM design are determined. KEY WORDS functionally graded materials(FGM);CAD;thermal stress;relaxation 设3·：