基于多尺度方法的平纹机织SiC/SiC复合材料力学性能预测

Prediction of Mechanical Properties Using Multi-scale Approach for Plain Woven SiC/SiC Composites

本文基于平纹机织SiC/SiC复合材料的多尺度特性以及微观结构的周期性,建立了微观尺度(纤维尺度)和中观尺度(纱线尺度)的单胞模型,利用Abaqus软件计算得出纤维尺度模型的力学性能参数,将这些参数导入纱线尺度模型中,同时编写相应的UMAT子程序来判断材料的损伤起始和损伤演化过程,模拟了平纹机织SiC/SiC复合材料在单向拉伸时的损伤演化以及破坏过程。结果表明X向拉伸应力应变曲线与试验曲线吻合良好,有效地预测了平纹机织SiC/SiC复合材料的强度性能和损伤演化过程。

Based on the multi-scale characteristics and the periodicity of microstructure of plain woven SiC/SiC composites,the unit cell models of microscale(fiber-scale)and mesoscale(yarn-scale)are established.The mechanical properties parameters of the microscale model were calculated by Abaqus software,which were then introduced into the yarn-scale model.The corresponding UMAT subroutine was written to judge the damage initiation and damage evolution process of the material.The damage evolution and failure process of plain woven SiC/SiC composites under uniaxial tension were simulated.The results show that the X-direction tensile stress-strain curve is in good agreement with the experimental curve.The strength properties and damage evolution of plain woven SiC/SiC composites are predicted.