含平均应力振动疲劳寿命分析方法评述

Review of vibration fatigue life analysis methods with mean stress

摘要:

含平均应力的振动疲劳问题广泛存在于各类工程结构之中，研究者们的处理方法不尽相同。为了对比讨论这些方法的适用性，回顾并梳理了近数十年来涉及含平均应力振动疲劳寿命评估问题的文献，将其中的 处理方法划分为两大类进行介绍：一是在材料的S-N 曲线中考虑平均应力的影响，二是直接计入平均应力与振动载荷共同造成的疲劳损伤；分别对比论述了各试验方法的试验原理与应用情况、各理论方法的模型基础与进一步的拓展研究，从各方法的理论基础、计算效果、应用范围等方面进行评估，指出现有研究中存在的不足，给出平均应力处理方法选取的建议，并展望了未来的发展方向。

Abstract:

Vibration fatigue with mean stress is widely used in various engineering structures, while researchers have different solving methods. In order to compare and discuss the applicability of these methods, literature on fatigue life evaluation with mean stress was reviewed and summarized in recent decades, and the treatment methods were divided into two categories: (1) The influence of mean stress is considered in the S-N curve of the material; (2) Directly calculate the fatigue damage of different mean stress and vibration load. Discussed the test principle and application of each test method, as well as the model basis and further development of each theory method respectively. Evaluated these methods from the aspects of theoretical basis, calculation effect, engineering application range, etc., then the shortcomings of existing research are pointed out, and the development direction of related research in the future is prospected .