The strength of plain-woven SiC/SiC composites was predicted with the multi-scale method. Firstly, a three-dimensional unit cell was used to characterize the geometric structure of plain-woven SiC/SiC composites. Secondly, the yarns were seen as minicomposites, whose axial mechanical properties were obtained by the shear-lag model, and the fiber defect model was adopted to simulate the failure process of minicomposites. The strength of plain-woven SiC/SiC composites predicted with the multi-scale method is in good agreement with the experimental result. Besides, the effects of heat treatment and load-carrying capacity of broken fiber on the strength of plain-woven SiC/SiC composites were evaluated, and the effect of woven geometry structure was also evaluated.

用多尺度方法预测了平纹SiC / SiC复合材料的强度。首先，使用三维晶胞表征平织SiC / SiC复合材料的几何结构。其次，将纱线视为微型复合材料，通过剪切滞后模型获得其轴向力学性能，并采用纤维缺陷模型模拟微型复合材料的破坏过程。用多尺度法预测的平纹SiC / SiC复合材料的强度与实验结果吻合良好。此外，评估了热处理和断裂纤维的承载能力对平纹SiC / SiC复合材料强度的影响，并评估了织造几何结构的影响。