| Modeling the Failure Time and Residual Strength of C/SiC
Composites under Stress-Oxidation Environment |
Peng Chen,1, 2 Xuming Niu,1 Xihui Chen,1 Zhigang Sun,1, 3, * Pengjian Zou1 and Yingdong Song1, 3, 4
Pages : 212-220
DOI : 10.1080/0371750X.2020.1808078 |
| Abstract |
| Based on the oxidation kinetics of C/SiC composites at 900o-1200oC in stressoxidation
environment, a non-uniform model of oxidation has been
suggested in this paper. Combined with fiber notch model, Curtin’s strength
model and BHE model, the non-uniform model is able to predict the failure
time and residual strength of C/SiC composites accurately. Besides, the
initial defects of the model (matrix coating crack and open porosity), the
effects of coating were taken into account, and the fiber strength and broken
ratio were analyzed. Furthermore, the effects of oxidation time, stress,
temperature, SiC coating thickness and volume fraction of fiber on the
failure time and residual strength were discussed, and the predicted results
showed a good consistency with the experimental data.
[Keywords: C/SiC composites, Stress-oxidation, Failure time, Residual
strength, Predictive model] |
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