13th International Conference on Fracture June 16–21, 2013, Beijing, China 7 4. Conclusions (1)At 1173K in air, ILSS of 2D-C/SiC is higher than that of 2.5D-C/SiC along the warp direction， but considerably lower compared with that of the weft direction for 2.5D-C/SiC. ILSS for 2D-SiC/SiC is considerably higher than that of 2D-C/SiC. (2) The great shear anisotropy between the warp and weft direction for 2.5D-C/SiC is associated with the characteristics of fiber preform architectures. For 2D-SiC/SiC and 2D-C/SiC composites, the difference of ILSS is mainly attributed to the kinds of fiber and oxidation of carbon fibers in the latter at 1173K in air. Acknowledgements This work has been supported by National Science Foundation of China (Grant No. 51172182), Basic Research Foundation of NWPU (Grant No. JC20100227), and the Program for New Century Excellent Talents in University (NCET-08-0460). References [1] R.R. Naslain, António Pereira Nascimento Filho, Processing of ceramic matrix composites. Key Eng Mater, 164–165(1998) 3-8. [2] K.G. Dassios, D.G. Aggelis, E.Z. Kordatos, T.E. Matikas, Cyclic Loading of a SiC-fiber Reinforced Ceramic Matrix Composite Reveals Damage Mechanisms and Thermal Residual Stress State. Composites Part A: Applied Science and Manufacturing, 44(2013) 105-113. [3] L. Daniel and G. Ramusat, ‘‘Prospective and Economic Impact of Composites in Reusable Launch Vehicle,’’ AIAA, 2005-6618. [4] Yan KF, Zhang CY, Qiao SR, Li M, Han D, Failure and strength of 2D-C/SiC composite under in-plane shear loading at elevated temperatures. Mater Des, 32(2011) 3504–8. [5] Camus G, Guillaumat L, Baste S, Development of damage in a 2D woven C/SiC composite under mechanical loading. Compos Sci Technol, 56(1996) 1363-72. [6] Dalmaz A, Reynaud P, Rouby D, Fantozzi G, Abbe F, Mechanical behavior and damage development during cyclic fatigue at high-temperature of a 2.5D carbon/SiC composite. Compos Sci Technol, 58(1998) 693–9. [7] Ö. Ünal, Narottam P, Bansal, In-plane and interlaminar shear strength of a unidirectional Hi-Nicalon fiber-reinforced celsian matrix composite. Ceramics International, 28(2002) 527–540. [8] Choi SR, Bansal NP, Interlaminar tension/shear properties and stress rupture in shear of various continuous fiber-reinforced ceramic matrix composites. Ceram Trans, 175(2006) 119-34. [9] Choi SR, Bansal NP, Shear strength as a function of test rate for SiCf/BSAS ceramic matrix Figure 6. SEM images of 2.5D-C/SiC at fracture surface (a) and near notch (b), 2D-C/SiC (c) and 2D-SiC/SiC (d) failed by interlaminar shear load
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