A hysteresis cycle can define the variation in mechanical characteristics of fatigue life and failure response. Traditional analysis is performed using force‐displacement signals derived from the testing equipment, but this approach is prone to large errors due to clearances and slips in the measuring chain. For this reason, the authors here propose a novel setup able to assess accurately the strain status of specimens by digital image correlation (DIC) and a procedure to calculate the hysteresis energy by thermographic analysis in order to measure the damping energy with precision. The results obtained by an experimental investigation on a common austenitic steel (AISI 304) highlight that the hysteresis areas defined by the DIC displacements, and those found by the testing machine outputs have substantial differences in value. The thermal variations and the areas of the hysteresis loops, both linked to the plastic energy, were also compared, showing a reliable correlation.

中文翻译：

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用热成像和数字图像相关方法对疲劳滞后进行能量分析

磁滞循环可以定义疲劳寿命和故障响应的机械特性的变化。传统的分析是使用来自测试设备的力-位移信号进行的，但是由于测量链中的间隙和打滑，这种方法容易产生较大的误差。因此，作者在此提出了一种新颖的装置，该装置能够通过数字图像相关（DIC）准确评估样品的应变状态，并提供一种通过热成像分析来计算滞后能量的程序，以便精确地测量阻尼能。通过对普通奥氏体钢（AISI 304）进行实验研究而获得的结果表明，由DIC位移定义的磁滞区域与由测试机输出所发现的磁滞区域的值存在很大差异。