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A chemo-mechanical coupled constitutive model applied to the oxidation simulation of SiC/SiC composite |
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| Authors: | Jie Bian Xihui Chen Zhigang Sun Xuming Niu Xubo Yao Weijing Wu Yingdong Song |
| Affiliation: | 1. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, P.R. China;2. State Key Laboratory of Mechanics and Control Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, P.R. China
Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, P.R. China Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, Nanjing, P.R. China |
| Abstract: | Herein, a chemo-mechanical coupled constitutive and failure model is proposed to predict the tensile behavior of SiC/SiC composites under oxidizing environments. The diffusion of O2 through the oxide scale and the oxidation reaction of SiC/O2 are modeled and implemented in finite element software, through a user-defined element. Numerical validation studies and tests are conducted on a domestic SiC fiber. An orthotropic constitutive model for reinforcements, which considers modulus reduction due to oxidation damage, and a continuum damage model associated with O2 diffusion along the micro-cracks in the SiC matrix are subsequently presented. The developed framework is used to simulate the mechanical behavior and oxidation process of a single fiber SiC/SiC composite. |
| Keywords: | chemical properties composites mechanical properties SiC/SiC |