Low cycle fatigue properties of low yield point steels
Shi Gang1 Gao Yang1 Wang Xun2 Zhang Yong3
1. Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Tsinghua University, Beijing 100084, China;
2. East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China; 3. Beijing JiaoTong University, Beijing 100044, China
Abstract： Due to its excellent energy dissipation capacity, the low yield point steel has been widely used in seismic design in recent years. In this work, the low cycle fatigue properties of low yield point steel LY100, LY160 and LY225 were tested under the large plastic deformation. The failure modes, cyclic stress response characteristics, cyclic stress-strain curves and the hysteretic curves were analysed, and the low cycle fatigue life curves were fitted and predicted based on the Manson-Coffin model and Kuroda model respectively. The results show that domestic low yield point steel has good capability to withstand low cycle fatigue; the Ramberg-Osgood model can fit well with the stress-strain curves; both Manson-Coffin model and Kuroda model can effectively match the low fatigue life curves, and the fitting effect of Manson-Coffin model is better, while Kuroda model is more applicable to fatigue life prediction under large strains.
