C/SiC复合材料的氧化行为仿真分析方法研究  

A Simulation Method for Oxidation Behavior of C/SiC Composites

作　　者：李军平 刘宝瑞[1,2] 童军[1] 张伟[1] 李尧 王晓晖[1,2] LI Junping;LIU Baorui;TONG Jun;ZHANG Wei;LI Yao;WANG Xiaohui(Beijing Institute of Structure and Environment Engineering,Beijing 100076,China;Science and Technology on Reliability and Environmental Engineering Laboratory Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)

机构地区：[1]北京强度环境研究所,北京100076 [2]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《强度与环境》2023年第5期28-36,共9页Structure & Environment Engineering

基　　金：国家自然科学基金(12002056)。

摘　　要：对C/SiC复合材料高温氧化过程的准确预示,是提升C/SiC复合材料热结构设计水平的关键技术之一。本文结合C/SiC复合材料氧化机理、多孔介质流动理论和Fick扩散定律,得到了不同温度作用下C/SiC复合材料的氧化动力学方程并建立了氧化失重的数学表达式。开发了氧化扩展UEL子程序,对典型C/SiC复合材料试件氧化过程中氧、碳元素的分布和氧化扩展过程进行了分析,分析结果显示不同温度下的氧化失重与试验数据可以很好吻合。Accurate prediction of the high temperature oxidation behavior of C/SiC composite is one of the key technologies for improving designs of C/SiC composite is thermal structures.Combining the oxidation mechanism,flow theory of porous media and Fick diffusion law,this work gains a dynamic equation for oxidation of C/SiC composites in different temperatures together with a mathematical expression of weight loss due to oxidation.A UEL subroutine is developed accordingly.Through finite element analyses,the oxidation process of a typical C/SiC composite was simulated and the distribution of C and O elements was analyzed.It shows a good agreement between the simulation and the experimental results of oxidation weight loss.

关 键 词：C/SIC复合材料 氧化动力学 仿真分析 失重量 

分 类 号：V414.8[航空宇航科学与技术—航空宇航推进理论与工程]