LOW CYCLE FATIGUE BEHAVIOR OF S550 HIGH-STRENGTH STEEL IN ARCTIC AREAS UNDER DIFFERENT STRAIN RATIOS
Liuyang. Feng 1 and Xudong. Qian1
1 Department of Civil and Environmental Engineering, Centre for Offshore Research and Engineering, National University of Singapore, Singapore 117576
This article presents a series of low-cycle fatigue tests of S550 high-strength steel at a low temperature ( ) under different strain ratios. According to the experimental results, this study a) calibrates the cyclic plasticity properties including the cyclic stress-strain curve and nonlinear hardening properties, and b) investigates the effect of the mean stress caused by the non-zero strain ratios on the low-cycle fatigue life. In addition, combined with the existing low-cycle fatigue test results of S550 at the room temperature, this study analyzes the effect of low temperature on the low-cycle fatigue life. Finally, this work presents a close estimation of the fatigue life at the low temperature, based on the calibrated damage mechanics parameters.
Low-cycle fatigue; low temperature; energy-based fatigue model; cyclic plasticity; damage mechanics