摘要
为了研究C/SiC复合材料壁板结构高温下剩余刚度的预测方法,基于气固反应动力学的原理建立400℃~1000℃的C/SiC复合材料氧化动力学模型,预测材料的质量损失率随时间和温度的变化趋势;利用刚度平均法计算壁板结构的力学性能参数,并将高温拉伸试验得到的弹性模量与理论预测的弹性模量加以对比,得到材料性能参数计算试验件在不同温度下的模态。研究结果表明:所提出的方法能较好地预测高温下C/SiC复合材料的力学性能。
To study the predicting method of the residual stiffness of C/SiC composite in high-temperature oxidation environments,a kinetic model for the oxidation of C/SiC composites at 400℃-1000℃was established based on the principle of gas-solid reaction kinetics,and the variation of the mass loss rate of the material with time and temperature was predicted.The mechanical property parameters of the wall plate structure were calculated using the stiffness averaging method,and the modulus of elasticity obtained from the high temperature tensile test was compared with the theoretically predicted modulus of elasticity.The modal frequencies of the wall panel structure at different temperatures are calculated based upon the material property parameters.The reserch results show that the proposed method can better predict the mechanical properties of C/SiC composites at high temperatures.
作者
齐梓政
QI Zizheng(Institute of Vibration Engineering Research,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《机械制造与自动化》
2025年第4期21-25,36,共6页
Machine Building & Automation
基金
国家自然科学基金项目(12072153)。
关键词
高温环境
C/SIC复合材料
氧化机制
弹性模量
热模态
high temperature environment
C/SiC composite
oxidation mechanism
elastic modulus
thermal modes
