Mesoscopic Modeling and Thermal and Mechanical Constant Prediction of Braided SiC(C)/SiC Composites

被引：0
作者：
Zeng H. [1 ]
Jing X. [1 ]
Sun Y.-S. [1 ]
机构：
[1] School of Power and Energy, Northwestern Polytechnical University, Xi’an
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2023年 / 44卷 / 09期
关键词：
Ceramic matrix composites; Elastic modulus; Mesoscopic model; Numerical simulation; Thermal conductivity;
D O I：
10.13675/j.cnki.tjjs.2209033
中图分类号：
学科分类号：
摘要：
In order to accurately and effectively evaluate the thermal and mechanical properties of ceramic matrix composites，two dimensional mesoscopic models of plain woven C/SiC composites，plain woven SiC/SiC composites and 2.5D SiC/SiC composites were established based on real CT scanning images，taking full account of the layering structure and internal pores of different braided structures. On this basis，the finite element model was constructed，and the equivalent elastic modulus and equivalent thermal conductivity were calculated. The correctness and effectiveness of the model were verified by comparing with the experimental results. The influence of microstructure on the distribution of stress concentration and heat flux concentration was analyzed. The results show that the pore geometry and distribution have a significant effect on the macroscopic thermal performance，and the stress concentration and heat flow concentration areas in the cross sections of the three materials are related to the areas before and after the weft and warp interweaving. The elasticity modulus and thermal conductivity of SiC fiber reinforced material are greater than that of C fiber reinforced material. Compared with plain woven structure，2.5D composite has higher modulus and thermal conductivity in the thickness direction and greater performance. © 2023 Journal of Propulsion Technology. All rights reserved.
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