中文摘要：

在热力学框架下，基于薄板假设，建立金属材料薄板试样在高周疲劳载荷作用下的热传导方程，将试样温度场数据和实时载荷信号导入，准确计算与高周疲劳损伤相关的单个循环内耗散能．基于该方法，以316L不锈钢材料为例，通过实时监测试样不同应力水平下高周疲劳破坏全过程中耗散能的变化，拟合出耗散能一疲劳寿命曲线，呈现与传统的应力一疲劳寿命曲线相同的规律；提出一种新的预测高周疲劳极限的能量法，确定的疲劳极限与实验值相近．

英文摘要：

A heat conduction equation under high-cycle fatigue loadings was established using sheet assumption within thermodynamic framework. Dissipated energy per cycle, correlated with fatigue damage, could be deduced from tempera- ture field data of specimen and real-time load signal. Then, taking 316L stainless steel for example, the dissipation energy per cycle variations were in-situ monitored during each high-cycle fatigue test under different stress levels. Dissipated energy versus fatigue lifetime curve shows the same pattern as the traditional stress versus fatigue lifetime curve. A new energy method was developed to predict high-cycle fatigue limit. The high-cycle fatigue limit determined by dissipated energy measurement was close to the experimental fatigue limit.