基于短裂纹特性的疲劳损伤参数

摘要

In order to understand which parameter, such as the number of cracks and the total crack length, is a useful indicator of fatigue damage, rotatory bending fatigue tests are carried out using smooth specimens of medium-carbon steel. The behavior of short fatigue propagation and the evolution of surface cracks during fatigue life are examined. The aim of this paper is to study how these damage parameters are correlated with the process of fatigue damage in order to evaluate the effectiveness of damage detection methods.%通过对中碳钢光滑试样的疲劳实验，研究了疲劳过程中短裂纹的扩展和演化行为，分析了基于短裂纹群体行为的疲劳损伤参数来描述疲劳损伤的有效性。通过研究裂纹总数和裂纹总长这两个参数在疲劳损伤过程中的动态变化，对基于短裂纹群体行为的疲劳损伤检测方法进行了评价