一、前言疲劳损伤是一个不可逆的能耗过程,循环过程滞回能(即循环塑性应变能)是确定循环过程中的能耗量的主要参数,因此它的计算精度与疲劳损伤估算的准确度有密切的关系。循环滞回能的大小等于它对应的滞回环的面积,当滞回环的形状确定时,其面积计算也不成问题。实验获得的循环滞回环的形状一般是未知的,且循环过程中每个循环滞回环是变化的,利用循环应力——应变曲线获得的滞回环方程来计算其大小很不精确。目前较常用的方法是对实验滞回环的人工直接测量,工作量繁重,人为误差大。本文在疲 I. INTRODUCTION Fatigue damage is an irreversible energy consumption process. The hysteresis (ie, cyclic plastic strain energy) of the cyclic process is the main parameter for determining the energy consumption during the cycle. Therefore, its accuracy and fatigue damage estimation accuracy There is a close relationship. The size of the cyclic hysteresis energy is equal to the area of ​​the corresponding hysteresis loop. When the shape of the hysteresis loop is determined, the area calculation is not a problem. The shape of the experimental cyclic hysteresis loop is generally unknown, and the hysteresis loop varies every cycle in the cycle. It is very inaccurate to calculate the hysteresis loop using the cyclic stress-strain curve. The most commonly used method is artificial direct measurement of experimental hysteresis loop, heavy workload, human error. This article is tired