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采用Mori-Tanaka方法分两步计算了含孔洞C/SiC纤维束的弹性常数,并进一步考虑经向纤维束在空间上的不完全连续,给出了更为准确的2.5D-C/SiC复合材料弹性性能计算模型。分析了纤维束内部孔洞形状及体积含量对2.5D-C/SiC复合材料弹性性能的影响,结果表明纤维束内部孔洞的形状对材料弹性性能影响较小,而纤维束内孔洞体积含量对材料弹性性能具有显著影响。通过材料的细观编织结构分析,基于经向纤维束的实际接触面积比例给出了相应的模量折减系数,计算得到2.5D-C/SiC复合材料的弹性常数,与试验结果的对比表明该计算模型更为合理。
The Mori-Tanaka method was used to calculate the elastic constants of C / SiC fiber bundles containing holes in two steps and to consider the spatially incomplete continuation of the warp fiber bundles. The more accurate 2.5DC / SiC composite elasticity Performance calculation model. The influence of void shape and volume content inside the fiber bundle on the elastic properties of 2.5DC / SiC composites was analyzed. The results show that the shape of the inner fiber bundle has little effect on the elastic properties of the material, while the void volume content in the fiber bundle has the effect on the material elastic properties Significantly affected. According to the analysis of the meso-weave structure of the material, the corresponding modulus reduction factor is given based on the actual contact area ratio of the warp fiber bundle, and the elastic constant of the 2.5DC / SiC composite material is calculated. The comparison with the test results shows that the calculation The model is more reasonable.