The present paper is devoted to rapid prediction of fatigue performance of materials for medium- and high-cycle fatigue based on the thermography approach. During cyclic loading, the temperature of specimens or components increases due to both anelastic and plastic deformation, while only the plastic strain energy contributes to fatigue damage. Therefore, in this work, a model is proposed to estimate the damaging (plastic strain energy) and non-damaging (anelastic energy) parts of the dissipated heat during the cyclic loading. It is also shown that by taking advantage of the concept of fracture fatigue entropy (FFE), one can rapidly generate a stress-life diagram by conducting a stepwise test and only one fatigue experiment until failure. Further, it is shown mathematically that the dissipating energy is directly proportional to the steady-state temperature. Therefore, in situations where determining the dissipation energy is difficult, the fatigue performance can be readily predicted only by measuring the steady-state temperatures during stepwise testing. The predictions of the proposed models are verified by comparison to a series of experimental results for different materials.

本文致力于基于热成像方法的中，高周疲劳材料的疲劳性能的快速预测。在循环加载过程中，由于无弹性和塑性变形，样品或部件的温度会升高，而仅塑性应变能会导致疲劳损伤。因此，在这项工作中，提出了一个模型来估算循环载荷过程中散热的破坏性（塑性应变能）和非破坏性（弹性能）部分。还显示出，利用断裂疲劳熵（FFE）的概念，可以通过进行逐步试验和仅一个疲劳试验直到失效，来快速生成应力-寿命图。进一步，从数学上表明，耗散能量与稳态温度成正比。因此，在难以确定耗散能量的情况下，仅通过在逐步测试期间测量稳态温度就可以容易地预测疲劳性能。通过与一系列针对不同材料的实验结果进行比较，验证了所提出模型的预测。