Fatigue life prediction of engineering components is essential for safe operation of mechanical systems. Energy based models have attracted much attention due to the combined considerations of stress and strain behavior, especially in low cycle fatigue regime. In this work, a new plastic strain energy density (PSED) based life prediction model for notched components subjected to cyclic loading is proposed, in which cyclic stress-strain responses under stress- and strain-controlled modes are both introduced. Experimental tests on 304 stainless steel smooth and notched plate/bar components are conducted for calibrations and verifications. The prediction capability of the proposed model is verified by experimental results.

工程部件的疲劳寿命预测对于机械系统的安全运行至关重要。由于综合考虑应力和应变行为，特别是在低周疲劳状态下，基于能量的模型引起了很多关注。在这项工作中，提出了一种新的基于塑性应变能密度（PSED）的循环载荷下缺口部件寿命预测模型，其中引入了应力和应变控制模式下的循环应力应变响应。对 304 不锈钢光滑和带缺口的板/棒部件进行实验测试以进行校准和验证。实验结果验证了所提出模型的预测能力。