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中文摘要：
通过观察C／C-SiC复合材料组元分布的扫描电子显微镜（SEM）照片，获得了C／C—SiC复合材料化学气相渗透（CVI）制备过程中产生孔隙和微裂纹的几何信息。在此基础上，建立了包含孔隙和微裂纹的C／C—SiC微结构有限元模型，并利用均匀化等效计算方法预测了平纹编织C／C-SiC复合材料的模量。针对CVI沉积方式制备的2组不同的C／C-SiC复合材料，实验测试与等效计算结果表明：基于SEM照片建立的C／C—SiC纤维束和复合材料微结构有限元模型，能够反映CVI工艺制备C／C—SiC中孔隙和微裂纹的分布状况；计算结果与实验数据有良好的一致性，数值计算可有效预测C／C—SiC编织复合材料的模量。
英文摘要：
The woven carbon fiber reinforced C-SiC binary matrix （C/C-SiC） composite manufactured by chemical vapor infiltration （CVI） method was investigated. Based on the material tomography of scanning electron microscopy （SEM）, distributions of porosities and micro-cracks were identified and included in the finite element model of C/C- SiC composites. The homogenization method was used for the evaluation of effective modulus of woven C/C-SiC composites. The results of the numerical computing and experimental tests were compared for two cases of C/C-SiC composites with different layer thickness. It is shown that the proposed finite element models of C/C-SiC can characterize physically the real situation of the involved porosities and micro-cracks related to the CVI process. The numerical results of effective modulus agree reasonably with the experimental ones.
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