2D编织CVI SiC_f/SiC复合材料热力学性能多尺度分析

Thermomechanical Properties Multi-scale Analysis of 2D Woven CVI SiC_f/SiC Composites

根据2D编织CVI SiCf/SiC复合材料微观单向结构RVE模型、细观含孔隙的编织结构RVE模型和微观组份材料性能,采用热固耦合双尺度渐进均匀化分析方法的分析程序,依次预测了复合材料微观、细观的热力学性能。分析得到了完整的SiCf/SiC复合材料宏观热力学性能,宏观弹性模量预测值与实验测量值相对误差7%以内,导热系数和热膨胀系数预测值基本落在试验结果统计范围内,为2D编织CVI SiCf/SiC复合材料构件热固耦合分析提供了基本材料参数。

By formulated thermal-solid coupling asymptotic expansion homogenization method,this paper predicts the microscopic and mesoscopic thermomechanical properties of 2 D woven CVI Si Cf/Si C composites in turn through multi-scale analysis from the fiber bundle micro RVE and 2 D woven mesoscopic RVE model with porosity and the micro components material performance. The thermomechanical properties of 2 D woven Si Cf/Si C composites are predicted. The relative error of the estimated tensile modulus value and experimental data is less than 7%.Coefficient of thermal conductivity and thermal expansion coefficient are within the scope of the statistical experimental results. The basic material parameters are provided for the thermal-solid coupling analysis of composites components.