通过理论模型和界面顶出实验分析了微观结构对碳/碳复合材料界面性能的影响机制.使用高分辨Micro-CT系统获得C/C复合材料界面的微观结构特征,并对界面的微观结构特征进行统计分析,得到界面微观结构尺度分布的概率密度函数.对C/C复合材料的界面层建立力学分析模型,计算获得C/C复合材料界面力学性能,在计算过程中引入界面微观结构的随机性统计分布,获得C/C复合材料界面力学性能的分布规律.设计纤维束顶出实验,测试分析C/C复合材料的界面力学性能.将力学分析模型的计算结果与界面顶出实验获得的实验结果进行对比分析,表明通过模型计算获得的界面性能的均值和离散度与实验获得的结果具有较好的一致性.
The relationship between the microstructure and the interracial properties of C/C composite was researched in this paper. The microstrueture features of the interfacial layers in C/C composite obtained by high resolution Micro-CT were statistically analyzed, and the probability density function of the interracial microstructure was achieved. Mechanical properties of the interracial layers in C/C composite were calculated by a hypothetic analysis model. The distribution of mechanical properties can be obtained through introducing a probability density function of the interfacial microstructure into this analysis model. The mechanical properties of the interfacial layers in C/C composite were measured by the push out tests of fiber bundles. Comparing the calculation results with the experimental results, it is found that the means and dispersions of these two results are accordant.
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