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Finite Element Analysis of the Crack Deflection in Fiber Reinforced Ceramic Matrix Composites with Multilayer Interphase Using Virtual Crack Closure Technique

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Abstract

Crack deflection along the interphase for fiber reinforced ceramic matrix composites (CMCs) is an important condition upon which the toughening mechanisms depend. The multilayer interphase is designed and developed to enhance this deflection mechanism. Combined with the virtual crack closure technique, a finite element model was proposed to predict the competition between crack deflection and penetration in multilayer interphase of CMCs. The model was used to analysis the propagation of primary matrix crack in a SiCf/SiCm composite with (PyC/SiC)n multilayer interphase. The effects of the number of sublayers, thicknesses of sublayers and thermal residual stress (TRS) on the energy release rate and the crack deflection mechanisms were studied. Results show that the multilayer interphase increases the ability to deflect the matrix crack at interfaces between sublayers. Moreover, the number of sublayers shows a larger effect than the thicknesses of the sublayers. The influence of TRS is much complex and needs to be evaluated accordingly. The research provides an analysis tool for promoting the toughening design of CMCs.

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Acknowledgments

This work was supported by the Natural Science Foundation of universities in Anhui Province (KJ2018A0057), the Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology (CEPE2018006), the National Key Research and Development Program of China (2017YFB0703200), and the National Natural Science Foundation of China (51575261, 51675266, 11972183).

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Authors and Affiliations

  1. School of Mechanical Engineering, Anhui University of Technology, Ma’anshan, 243002, China

    Fang Guangwu

  2. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Fang Guangwu, Gao Xiguang & Song Yingdong

  3. AECC Sichuan Gas Turbine Establishment, Chengdu, 610500, China

    Li Long

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  1. Fang Guangwu
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  2. Li Long
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  3. Gao Xiguang
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  4. Song Yingdong
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Correspondence to Fang Guangwu.

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Guangwu, F., Long, L., Xiguang, G. et al. Finite Element Analysis of the Crack Deflection in Fiber Reinforced Ceramic Matrix Composites with Multilayer Interphase Using Virtual Crack Closure Technique. Appl Compos Mater 27, 307–320 (2020). https://doi.org/10.1007/s10443-020-09810-w

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  • DOI: https://doi.org/10.1007/s10443-020-09810-w

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