【摘要】 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。更多还原

【Abstract】 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.更多还原