圆板状SiC/C功能梯度材料残余热应力特征有限元分析  

Finite element analysis of the residual thermal stress of discal SiC/C functionally graded material

作　　者：张国兵[1] 郭全贵[1] 刘朗[1] 史景利[1] 翟更太[1] 宋进仁[1] 

机构地区：[1]中国科学院山西煤炭化学研究所炭材料重点实验室

出　　处：《功能材料》2007年第7期1102-1105,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10205023)

摘　　要：功能梯度材料残余热应力的大小及分布对其性能有效发挥及长期稳定使用有着较大的负面影响,为了尽可能充分发挥材料性能,增加材料的使用寿命,需尽可能减小残余应力以及使其合理分布。本文采用ANSYS有限元分析软件对不同叠层工艺参数的等离子体第一壁候选材料———SiC/C功能梯度材料（FGM）的残余热应力进行了数值模拟,获得了使热应力有效缓和的较适宜的工艺参数,对实际研发制备目标材料也可提供一些理论参照。相关结果表明,适量增加梯度叠层数及中间梯度层厚度可逐步有效缓和残余热应力,同时,针对本文今后应用的仍以炭材料为主体的炭基陶瓷保护层复合SiC/C FGM而言,纯SiC层厚度应取较小值,而叠层成分分布指数应取0.8～1.0为宜。The absolute value and distribution of residual thermal stress of functionally graded material（FGM） have bad effects on its structure and properties in the process of preparing and using it.In order to reduce the bad effects,the maximum residual thermal stress should be decreased and distributed in an appropriate place.At present,researchers mostly analyzed the residual thermal stress of FGM by the numerical simulation method.By numerical simulating and comparing the residual stress of the FGMs with different series of technologic parameters,the optimized series of technologic parameters can be obtained and the corresponding FGM has the minimum residual thermal stress.Furthermore,the theoretic guidance can be provided for practically designing and fabricating the material.In this paper,the residual thermal stress of discal SiC/C functionally graded material was simulated by ANSYS finite element analyzation software.The simulating results showed that the residual thermal stress can be decreased gradually with the increase of the graded layer number and the thickness of middle graded layers.Moreover,the thickness of pure SiC layer should be a small value and the compositional distribution factor（P） should be 0.8≤P≤1.0 for the carbon-matrix ceramic protective layer FGM in the application of the future thermal-structural material.

关 键 词：SIC/C 功能梯度材料 残余热应力 有限元 

分 类 号：TB33[一般工业技术—材料科学与工程] TB34