Failure Modeling of SiC/SiC Mini-Composites in Air Oxidizing Environments |
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| Authors: | Guoqiang Yu Xiguang Gao Yue Chen Yingdong Song |
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| Affiliation: | 1.Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,People’s Republic of China;2.Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,People’s Republic of China;3.State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing,People’s Republic of China |
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| Abstract: | An iterative method was presented for simulation of the failure process of SiC/SiC mini-composites with pyrolytic carbon interphase exposed to air oxidizing environments under a constant load at 900 °C. This method was based on the possibility fracture strength of SiC fibers caused by random defects and the fiber stress distribution in mini-composites. The fiber strength probability model and Monte Carlo simulation were combined to generate the fracture strength along SiC fibers at 900 °C. The influence of fiber arrangement on fiber stress distribution was assessed to simplify the geometry model which was used to calculate the fiber stress distribution in the mini-composites. The failure process of the mini-composites was simulated, and the calculated oxidation life of the mini-composites matches the experimental data well with an error of ?9.40%. |
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