Modeling oxidation damage of continuous fiber reinforced ceramic matrix composites
Modeling oxidation damage of continuous fiber reinforced ceramic matrix composites
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DOI：
10.1007/s10409-011-0438-8
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发表时间：
2011-06
影响因子：
3.5
通讯作者：
Chengpeng Yang;G. Jiao;Bozhe Wang
中科院分区：
文献类型：
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作者：
Chengpeng Yang;G. Jiao;Bozhe Wang
对于纤维增强陶瓷基复合材料(CMCs)来说，高温应用中，组分的氧化是一种非常重要的损伤类型。在氧化过程中，热解碳界面沿纤维的轴向从裂纹处逐渐凹陷到材料内部。碳纤维通常会出现缺口状或局部缩颈氧化现象，导致强度下降。但是，碳化硅纤维降解的原因是其表面的缺陷生长机制。建立了基于上述机理的细观力学模型，模拟了CMCs高温氧化后的力学性能。应用统计理论和剪滞理论，分别推导了残余拉伸模数和强度的计算公式。同时，考虑了相间退缩和纤维强度退化。然后，将该模型应用于一种C/SiC复合材料，对模型进行了验证。
For fiber reinforced ceramic matrix composites (CMCs), oxidation of the constituents is a very important damage type for high temperature applications. During the oxidizing process, the pyrolytic carbon interphase gradually recesses from the crack site in the axial direction of the fiber into the interior of the material. Carbon fiber usually presents notch-like or local neck-shrink oxidation phenomenon, causing strength degradation. But, the reason for SiC fiber degradation is the flaw growth mechanism on its surface. A micromechanical model based on the above mechanisms was established to simulate the mechanical properties of CMCs after high temperature oxidation. The statistic and shearlag theory were applied and the calculation expressions for retained tensile modulus and strength were deduced, respectively. Meanwhile, the interphase recession and fiber strength degradation were considered. And then, the model was validated by application to a C/SiC composite.