Abstract: In order to study the effects of corrosion damage on the fracture mechanism of cold-formed thin-walled steel plates, tensile tests were conducted on the standard specimens which were processed from the flat and corner parts of C-shaped steel purlin that has been used in an industrial environment for many years. The effects of rust pit depth,the depth-radius ratio and section loss rate on stress triaxiality and equivalent plastic strain of the model were studied by finite element numerical analysis. The tensile test results show that as the degree of rust increases, the plastic hardening stage and necking stage gradually shorten, and the yield stage gradually disappears, and the yield strength, ultimate strength and fracture strain of the specimen gradually decrease. The results of finite element analysis show that the stress triaxiality gradually increases with the increase of the rust pit depth and depth-radius ratio, but does not change significantly with the increase of the section loss rate. The equivalent plastic strain increases significantly with the increase of the rust pit depth and section loss rate, but first increases and then decreases with the increase of the depth-radius ratio. According to the fitting results, the void growth model (VGM model) and the stress modified critical strain mo-del (SMCS model) are modified to derive the fracture model of cold-formed thin-walled steel plates under pitting damage and comprehensive corrosion damage.
1 Li Y Q, Xu H J. Journal of Building Structure, 2019, 49(19), 91(in Chinese). 李元齐, 徐厚军.建筑结构, 2019,49(19),91. 2 Zhong G H. Progress in Steel Building Structures, 2002, 4(4), 31(in Chinese). 钟国辉.建筑钢结构进展, 2002,4(4),31. 3 Xu S H, Wang H, Su L, et al. Journal of Southeast University (Natural Science Edition), 2016,46(6),1257(in Chinese). 徐善华, 王皓, 苏磊, 等.东南大学学报(自然科学版), 2016,46(6),1257. 4 Qiu B, Xu S H. Materials for Mechanical Engineering, 2014,38(10), 60(in Chinese). 邱斌, 徐善华.机械工程材料, 2014,38(10),60. 5 Wang Y D, Xu S H, Wang H, et al. Construction and Building Mate-rials, 2017,152,777. 6 Nie B, Xu S H, Yu J, et al. Journal of Constructional Steel Research, 2019,162,1. 7 Xu S H, Li R, Su C, et al. Journal of Harbin Institute of Technology, 2018,50(12),74(in Chinese). 徐善华, 李柔, 苏超, 等.哈尔滨工业大学学报, 2018,50(12),74. 8 Rice J R, Tracey D M. Journal of the Mechanics and Physics of Solids,1969,17,201. 9 Hancock J W, Mackenzie A C. Pergamon,1976,24,147. 10 Johnson G R, Cook W H. Pergamon,1985,21,31. 11 Gurson A L. Journal of Engineering Materials & Technology,1977,99,2. 12 Liao F F, Wang W, Chen Y Y. Structural Engineering and Mechanics, 2012,42,153. 13 Xing J H, Guo C L, Zhang P, et al. Journal of Building Materials, 2015,18(2),228(in Chinese). 邢佶慧,郭长岚, 张沛,等.建筑材料学报, 2015,18(2),228. 14 Zhou H, Wang Y Q, Shi Y J, et al. Engineering Mechanics, 2015,32(5),37(in Chinese). 周晖, 王元清, 石永久, 等.工程力学, 2015,32(5),37. 15 Metallic materials-tensile testing at ambient temperature: GB/T 228- 2010. Standards Press of China, 2010(in Chinese). 金属材料室温拉伸试验: GB/T 228-2010. 中国标准出版社,2010. 16 Liu X Y, Wang Y Q, Shi Y J. Journal of Building Structures, 2016,37(6), 228(in Chinese). 刘希月,王元清,石永久. 建筑结构学报, 2016,37(6), 228.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2021, Vol. 35 
