13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- matrix plays an important role in the damage evolution. 1200 1400 2000 2500 5000 5900 10000 Figure 12. The damage process of the matrix with void 5. Conclusions This paper focuses on the 2D plain woven C/SiC, and the conclusions are as follows: 1) The geometry model of RVE is established based on the photomicrograph of the 2D plain weave C/SiC by SEM with the yarn/matrix interface successfully introduced. And the damage models for the matrix, yarn/matrix interface and yarns are considered. 2) The established meso-level FEM is able to describe mechanical behavior of different constituents in the plain-woven C/SiC. Especially, the damage initiates in the matrix at the overall stress about 50Mpa, which agrees well with the experiments. 3) The damage of the matrix initiates near the void and spreads in transverse directions, and spreads through the section of the RVE; the damage of the fiber begins at the very region of the weaving point in longitudinal yarns and spreads in transverse direction; the damage of the yarn/matrix occurs near the weaving edge and spreads both in transverse and longitudinal directions. 4) The void in the matrix has great influence on the damage initiation and evolution of the matrix in the RVE model. It is found that the damage of the matrix without void initiates near the yarn in Z direction at the thin region of the matrix, while the damage of the matrix with void initiates around the void. Acknowledgements This work is supported by the Open Foundation provided by the State Key Laboratory of Explosion Science and Technology (KFJJ12-14M), the Natural Science Foundation of China (90916027), and the Natural Science Fund for Young Scholars of China (11102168). References [1] C. Gerald, G. Laurent, B. Stephane, Development of damage in a 2D woven C/SiC composite under mechanical loading: I. mechanical characterization. Composites Science and Technology, 56 (1996) 1363–1372. [2] E.B. Rachid, B. Stephane, C. Gerald, Development of damage in a 2D woven C/SiC composite under mechanical loading: II. ultrasonic characterization. Composites Science and Technology, 56 (1996) 1373–1382. [3] M. Hui, L.F. Cheng, L.T. Zhang, Y.D. Xu, Z.X. Meng, C.D. Liu, Damage evolution and microstructure characterization of a cross-woven C/SiC composite under tensile loading. Journal of the Chinese ceramic society, 35 (2007) 137–143. (in Chinese) [4] C.P. Yang, G.Q. Jiao, B. Wang, Tensile damage behavior of 2D-C-SiC composite. Journal of Aeronautical Materials, 30 (2010) 87–92. (in Chinese) [5] G.Y. Guan, G.Q. Jiao, Z.G. Zhang, Uniaxial macro-mechanical property and failure mode of a 2D-woven C/SiC composite. Acta Material Composite Sinica, 22 (2005) 81–86. (in Chinese) [6] M.D. Wang, C. Laird, Characterization of microstructure and tensile behavior of a cross-woven C-SiC composite. Acta mater, 44 (1996) 1371–1387.
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