Analysis of Residual Performance of UD-CMC in Oxidation Atmosphere Based on a Notch-like Oxidation Model

作者：Sun, Zhigang^*; Shao, Hongyan; Chen, Xihui; Song, Yingdong

来源：Applied Composite Materials, 2016, 23(5): 1079-1098.

DOI：10.1007/s10443-016-9500-9

• Ceramic-matrix composites (CMCs)
• Mechanical properties
• Analytical modelling
• Finite element analysis (FEA)

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 A degrees 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.

• 出版日期2016-10
• 单位南京航空航天大学