随机疲劳累积损伤理论研究进展

ADVANCES IN STOCHASTIC THEORY OF FATIGUE DAMAGE ACCUMULATION

对疲劳载荷、应力、寿命和强度的随机性分别进行了明确分类．然后，针对在疲劳理论发展史上有代表性的、目前在国内外仍被大量引用的（主要用于裂纹起始阶段的）疲劳累积损伤准则，从力学、概率统计等方面进行了较深入系统的分析．提出疲劳损伤累积具有两类不同的概率机制，即损伤在单一个体内具有的随机性以及损伤在同一母体中不同个体之间具有的分散性．最后，重点介绍了二维概率Miper准则以及有关随机疲劳寿命、随机疲劳强度等方面的研究进展．

In this paper, the randomness of fatigue loading, fatigue stress, fatigue life and fatigue strength are clearly classified. Then, typical accumulative damage rules developed in the history of fatigue theory and still employed currently are systematically analysed according to the mechanism of mechanics-probability and the usage range. Two different probabilistic interpretations about fatigue damage accumulation, i.e., the stochastic nature of damage developed in a single individual and the scatter of damage between different individuals in a population, are proposed. In the end, two-dimensional probabilistic Miner's rule is described briefly.