Y. Li et al./ Materials Science and Engineering A 507(2009)6-12 装 (a)LD 2D-composite(=10-1/s) (E=2 (c)IID 2D-composite(E=10-1/ (d )ID2D-composite(E=850 1/s) Fig. 9. SEM micrographs of the 2D-C/Sic composites with different densification at quasi-static and dynamic loading. 4. Conclusions Education of China(No. 20070699044)and the 111 project(B07050) to the Northwestern Polytechnical University. The authors also In this paper, the uniaxial compressive behavior of 3D needle- thank Professor Laifei Cheng for providing the 3D needle-punched punched CSic composite at room temperature was investigated C/SiC composite. t strain rate ranging from 10-4 to 6.5 x 10 1/s using the elec- tronic universal testing machine and the split Hopkinson pressure references bar technique. Pseudoplasticity due to the fracture of Sic matrix is observed for specimen tested at all strain rates. Although the [11 LT Zhang. LE Cheng Y.D. Xu, Aeronautical Manufacturing Technology 1(2003 compression strength of the material increases with the strain rate, the strain rate sensitivity of the material is considered to be lov [21 M.S. Liu, YL Li, F. Xu, Z J. Xu, LF. Cheng, Materials Science and Engineering A 489(1-2)(2008)120-126 The compression strength of the 3D needle-punched C/Sic compos- [3] G.Y. Guan, G Q Jiao, Z.G. Zhang, Acta Material Composite Sinica 22(4)(2005) m is 8.19, which is comparable with that of the LD 2D-C/SiC com- 14 WG.Pan. GO liao, C.Y. Guan, Journal of the Chinese Ceramic Society 33(11) osites. The needle-punched fibers enhance the toughness of the [51 E.B. Rachid, B Stephane, C. Gerald, Composite Science and Technology 56(1996) 3D needle-punched C/SiC composite. The failure pattern of the 3D 1373-1382 needle-punched C/Sic composite also varies with strain rate. Shear 6 YH. Wan, Y D. Xu, W.G. Pan, Fiber Reinforced Plastics/composites 5(2005 failure and delamination play prominent roles in the fracture pi [7 M D Curry. ]. Kowal, J W. Sawyer, Proceedings of 1st IAF/ AlAA Space Transporta- ess under quasi-static loading whereas a split pattern features tion Symposium, Huntsville, Alabama, April 11-12, 2002, pp 1-29. the failure mode under dynamic loading. Rough fracture surface of [8 W.G. Pa G.Q. Jiao, G Y Guan, B. Wang, Journal Ceramic Society specimens tested is observed at the strain rates of 10-4 and 10-21/s 19) N. Ekabsons,)varna, Mechanics of Composite Ma 37(4)(2001) while relatively smooth fracture surface is observed for those tested at high strain rate. [101 Y Xu, L Zhang, L Cheng, Carbon 36(7-8)(1998)1051-1056 ee of e Acknowledgem olytechnical University, China, 2005. [131 P. Xiao, J.w. Xie, XXiong. Z.Q. Yan, Journal of Central South University (Science This research was supported by the National Natural Science [14)S W Fan, Y.D. Xu, LT Zhang, Material Science and Engineering A 467(1)(2007) Foundation of China(No. 90405016), Doctoral Fund of Ministry of 53-58Y. Li et al. / Materials Science and Engineering A 507 (2009) 6–12 11 Fig. 9. SEM micrographs of the 2D-C/SiC composites with different densification at quasi-static and dynamic loading. 4. Conclusions In this paper, the uniaxial compressive behavior of 3D needle￾punched C/SiC composite at room temperature was investigated at strain rate ranging from 10−4 to 6.5 × 103 1/s using the elec￾tronic universal testing machine and the split Hopkinson pressure bar technique. Pseudoplasticity due to the fracture of SiC matrix is observed for specimen tested at all strain rates. Although the compression strength of the material increases with the strain rate, the strain rate sensitivity of the material is considered to be low. The compression strength of the 3D needle-punched C/SiC compos￾ite obeys the Weibull distribution. The calculated Weibull modulus m is 8.19, which is comparable with that of the LD 2D-C/SiC com￾posites. The needle-punched fibers enhance the toughness of the 3D needle-punched C/SiC composite. The failure pattern of the 3D needle-punched C/SiC composite also varies with strain rate. Shear failure and delamination play prominent roles in the fracture pro￾cess under quasi-static loading whereas a split pattern features the failure mode under dynamic loading. Rough fracture surface of specimens tested is observed at the strain rates of 10−4 and 10−2 1/s while relatively smooth fracture surface is observed for those tested at high strain rate. Acknowledgements This research was supported by the National Natural Science Foundation of China (No. 90405016), Doctoral Fund of Ministry of Education of China (No. 20070699044) and the 111 project (B07050) to the Northwestern Polytechnical University. 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