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Multi-scale Model of Residual Strength of 2D Plain Weave C/SiC Composites in Oxidation Atmosphere

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Abstract

Multi-scale models play an important role in capturing the nonlinear response of woven carbon fiber reinforced ceramic matrix composites. In plain weave carbon fiber/silicon carbon (C/SiC) composites, the carbon fibers and interphases will be oxidized at elevated temperature and the strength of the composite will be degraded when oxygen enters micro-cracks formed in the as-produced parts due to the mismatch in thermal properties between constituents. As a result of the oxidation on fiber surface, fiber shows a notch-like morphology. In this paper, the change rule of fiber notch depth is fitted by circular function. And a multi-scale model based upon the change rule of fiber notch depth is developed to simulate the residual strength and post-oxidation stress–strain curves of the composite. The multi-scale model is able to accurately predict the residual strength and post-oxidation stress–strain curves of the composite. Besides, the simulated residual strength and post-oxidation stress–strain curves of 2D plain weave C/SiC composites in oxidation atmosphere show good agreements with experimental results. Furthermore, the oxidation time and temperature of the composite are investigated to show their influences upon the residual strength and post-oxidation stress–strain curves of plain weave C/SiC composites.

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Acknowledgments

Supports of this project provided by National Basic Research Program of China, National Natural Science Foundation of China (51575261), Aeronautical Science Foundation of China (2012ZB52026,2014ZB52024), the Fundamental Research Funds for the Central Universities (NJ20160038) are gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory of Aero-Engine Thermal Environment and Structure, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China

    Xihui Chen, Zhigang Sun, Jianfen Sun & Yingdong Song

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  1. Xihui Chen
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  2. Zhigang Sun
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  4. Yingdong Song
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Correspondence to Zhigang Sun.

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Chen, X., Sun, Z., Sun, J. et al. Multi-scale Model of Residual Strength of 2D Plain Weave C/SiC Composites in Oxidation Atmosphere. Appl Compos Mater 24, 1–22 (2017). https://doi.org/10.1007/s10443-016-9511-6

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  • DOI: https://doi.org/10.1007/s10443-016-9511-6

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