中南大学学报（自然科学版）2012，Vol.43Issue(9)：3408-3414,7.
SiC/C功能梯度材料的热-应力耦合分析
Thermo-stress coupling analysis of SiC/C functionally graded materials
摘要
Abstract
The mathematic modes of the thermal stress coupled problem of SiC/C functionally graded materials (FGMs) and the layered material by joining two dissimilar materials of SiC and graphite (without transition layer) were established. The simulated diagrams of stress distribution of these two types of materials under thermal load of 1 000 °C were achieved by using finite element method and ANSYS10.0 software. The comparison between their thermal stress distributions was made to realize the optimized design on compositions and microstructures of SiC/C FGMs. The results show that SiC/C FGMs has obvious advantages to reduce thermal stresses compared to the layered material without transition layer. The maximum stress of the former is lesser than that of the latter. The more the transition layers, the lesser the maximum stress. The maximum stress of SiC/C-11 is about one half of that of the latter. The shapes of their stress distribution are parallel bands with axial symmetry. The stress is maximum in the interfaces and minimal in the middle regions of the layers. With the growth in number of the transition layers, the stress gradient decreases, and the stress bands in the interfaces becomes narrower until it narrower and disappears along the thickness direction from the SiC layer to the graphite layer, and the stress in the interfaces achieves the minimum. The optimum transition layer number for SiC/C FGMs is N≥9.关键词
SiC/C/梯度复合材料/热应力/有限元Key words
SiC/C/functionally graded materials (FGMs)/thermal stress/finite element分类
通用工业技术引用本文复制引用
蔡艳芝,尹洪峰,袁蝴蝶..SiC/C功能梯度材料的热-应力耦合分析[J].中南大学学报（自然科学版）,2012,43(9):3408-3414,7.基金项目
西安建筑科技大学人才科技基金资助项目(RC1039) （RC1039）
"濮耐"教育奖学金青年教师科研基金资助项目(2011) （2011）
陕西省自然科学基金资助项目(2000C13) （2000C13）
