Analysis of Residual Performance of UD-CMC in Oxidation Atmosphere Based on a Notch-like Oxidation Model
Analysis of Residual Performance of UD-CMC in Oxidation Atmosphere Based on a Notch-like Oxidation Model
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DOI：
10.1007/s10443-016-9500-9
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发表时间：
2016-06
影响因子：
2.3
通讯作者：
Zhigang Sun;H. Shao;Xihui Chen;Yingdong Song
中科院分区：
文献类型：
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作者：
Zhigang Sun;H. Shao;Xihui Chen;Yingdong Song
实验观察表明，单向陶瓷基复合材料（UD-CMC）在高温不均匀气氛下会与氧发生反应。由于纤维表面的氧化，纤维呈现出缺口状形貌。纤维缺口附近的应力集中导致UD-CMC的力学性能下降。本文用圆函数拟合了纤维切口深度的变化规律。在此基础上，推导出了UD-CMC在400-900 °C气氛下的残余强度和残余模量。采用有限元法模拟了单向C/SiC复合材料的力学性能。得到了纤维、基体和界面的应力分布。采用理论方法和有限元方法预测了单向C/SiC复合材料的剩余性能。并将预测结果与实验数据进行了比较。预测结果与实验数据吻合较好，表明缺口氧化模型可以有效地分析UD-CMC的力学性能。
Experimental observation indicates unidirectional ceramic matrix composites (UD-CMC) will react with oxygen under high-temperature atmosphere inhomogeneous. As a result of the oxidation on fiber surface, fiber shows a notch-like morphology. Stress concentration near by the fiber notch causes a decline of the mechanic performance of UD-CMC. In this paper, the change rule of fiber notch depth is fitted by circular function. Based on this formula the residual strength and modulus of UD-CMC under 400–900 °C atmosphere are derived. The mechanical performance of unidirectional C/SiC composite is simulated by finite element method. The stress distribution of fiber, matrix and interface are obtained. The residual properties of unidirectional C/SiC composite are predicted by theoretical method and finite element method. And the predicting results are compared with the experiment data. The predicting results show a good accordance with experiment data, which means the notch-like oxidation model can analyze the mechanic performance of UD-CMC efficiently.