Variable total strain amplitude loading of 316L

This project investigates the behaviour of steel 316L under variable total strain amplitude loading, with a focus on understanding the material's response to complex loading conditions. Quasistatic tensile testing and fully reversed constant amplitude fatigue tests were conducted to characterize the material's properties. The variable amplitude tests were performed under total strain control, and the resulting stress-strain hysteresis loops were analysed to reveal the occurrence of mean stress after a drop in strain amplitude. Notably, the sign of the mean stress depends on the direction of strain transition between the tensile and compression domains. Furthermore, an ideal plastic material behaviour was observed after strain increase accompanied by mean stress. To facilitate further research and model development, the experimental data are published in combination with a research paper:
Variable strain amplitude loading of steel 316L – experimental results and analytical modelling

本项目研究316L钢在变总应变幅加载下的行为，重点探究材料对复杂加载条件的响应特性。通过开展准静态拉伸试验与完全反向恒幅疲劳试验，对材料性能进行了表征。变幅试验在总应变控制条件下实施，分析所得应力-应变滞后回线后发现，应变幅下降后会出现平均应力；值得注意的是，平均应力的符号取决于拉伸与压缩域之间的应变转变方向。此外，在应变增大并伴随平均应力的情况下，观察到材料呈现理想塑性行为。为助力后续研究与模型开发，实验数据已与研究论文《316L钢的变应变幅加载——试验结果与解析建模》一同发表。