Tensile Mechanical Behavior of Notched 2D-Cf/SiC Composites
GUO Hong-bao1, WANG Bo1, JIAO Gui-qiong1, LIU Yong-sheng2
1. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710129, China;
2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Abstract：The influence of notch types on tensile mechanical behavior of 2D-Cf/SiC composite laminates was studied by experimental and numerical methods. Specimens with symmetrical V shape, half round shape and hairline shape notches were tested respectively. The relationship between net stress and tensile deformation closed to the notches was obtained with extensometer. With strain gauges on the surface of notched specimens, the strain variation between notches was obtained. And strain concentration effect was also clearly expressed. In accordance with the law of strain variation, the damage evolution and failure process of the notched specimens were analyzed. By comparing results with that of standard specimens, the failure mechanism of the notched 2D-Cf/SiC composites was discussed, the main influencing factors to the tensile strength were also determined. Furthermore, by finite element analysis (FEA), the strain distribution of notched specimens was simulated. The results indicate that there exists asynchronous damage evolution and failure process on material between notches during tensile process, and the specimen’s net tensile strength decreases to some extent with different notch types; the FEA results have good agreement with experimental data.
邹武,张康助,张立同.陶瓷基复合材料在火箭发动机上的应用[J].固体火箭技术,2000,23(2):60-64. ZOU Wu, ZHANG Kang-zhu, ZHANG Li-tong. Application of ceramic matrix composite to rocket motor[J]. Journal of Solid Rocket Technology, 2000, 23(2):60-64.
张建艺.陶瓷基复合材料在喷管上的应用[J].宇航材料工艺,2000,(4):14-16.ZHANG Jian-yi. Ceramic matrix composite applications in nozzle[J]. Aerospace Materials and Technology, 2000,(4):14-16.
熊伟,矫桂琼,刘红霞.平纹编织C/SiC复合材料的断裂韧性[J].硅酸盐学报,2008,36(8):1057-1061.XIONG Wei, JIAO Gui-qiong, LIU Hong-xia. Fracture toughness of plain woven C/SiC composites[J]. Journal of the Chinese Ceramic Society, 2008, 36(8):1057-1061.
管国阳,矫桂琼,张增光,等.平纹编织C/SiC复合材料的失效判据[J].硅酸盐学报,2005,33(9):1100-1104.GUAN Guo-yang, JIAO Gui-qiong, ZHANG Zeng-guang, et al. Phenomenal failure criteria of a plain woven C/SiC composite[J]. Journal of the Chinese Ceramic Society, 2005, 33(9):1100-1104.
杨成鹏,矫桂琼,王波.2D-C/SiC复合材料的单轴拉伸力学行为及其强度[J].力学学报,2011,43(2):330-337.YANG Cheng-peng, JIAO Gui-qiong, WANG Bo. Uniaxial tensile stress-strain behavior and strength of plain woven C/SiC composite[J]. Chinese Journal of Theoretical and Applied Mechanics, 2011, 43(2):330-337.
WU Xiao-jun, QIAO Sheng-ru, HOU Jun-tao, et al. Tensile creep behavior of notched two-dimensional-C/SiC composite[J]. Composites Science and Technology, 2006, 66(7-8):993-1000.
JU S H, CHUNG H Y, JHAO B J. Experimental calculation of mixed-mode notch stress intensity factors for anisotropic materials[J]. Engineering Fracture Mechanics, 2009, 76(14):2260-2271.
JI Gang-chang, QIAO Sheng-ru, DU Shuang-ming, et al. Three-point bending fracture characteristics of three-dimensional-C/SiC with single-edge notch beam specimens[J]. Materials Science and Engineering:A, 2008, 483-484:123-126.
侯军涛,乔生儒,韩栋,等.2D-C/SiC缺口试样的拉-拉疲劳损伤[J].材料导报,2005,19(11):140-143. HOU Jun-tao, QIAO Sheng-ru, HAN Dong, et al. Tension-tension fatigue damages of 2D-C/SiC notched specimens[J]. Material Review, 2005, 19(11): 140-143.
侯军涛,乔生儒,韩栋,等.2D-C/SiC缺口试样的拉伸行为[J].宇航材料工艺,2006,36(5):44-49. HOU Jun-tao, QIAO Sheng-ru, HAN Dong, et al. Tensile behaviors of 2D-C/SiC notched specimens[J]. Aerospace Materials and Technology, 2006, 36(5):44-49.
HEREDIA F E, SPEARING S M, MACKIN T J, et al. Notch effects in carbon matrix composites[J]. J Am Ceram Soc, 1994, 77(11):2817-2827.