【摘要】 疲劳过程的不确定性以及影响疲劳寿命的不确定性因素较多,导致疲劳寿命的分散性难以预测,在疲劳寿命预测模型中采用统计学和概率论的概念和方法是描述疲劳过程不确定性和疲劳寿命分散性的一种重要手段。本文针对疲劳寿命预测概率模型进行综述,总结和介绍了疲劳寿命经验公式和参数的随机化模型、表征疲劳寿命离散性的统计模型、基于材料微结构和疲劳物理机制的疲劳寿命预测概率模型以及研究广布疲劳损伤的概率模型,并对金属材料与结构的疲劳寿命预测方法进行了展望。更多还原

【Abstract】 Because of the uncertainty of fatigue damage process and the uncertain influence factors for fatigue life,it is difficult to predict the fatigue life of metal materials and the variability of fatigue life.Combining the statistical theory and probabilistic method in the fatigue life prediction model is the most important method to describe the uncertain and statistical nature of fatigue process and the variability of fatigue life.In this paper,the development and application of fatigue life prediction model for metal materials are reviewed.The random model based on empirical fatigue life theory,the statistical model for characterizing the variability,the probabilistic model for fatigue life prediction based on microstructure and physical mechanism of fatigue,and the probabilistic model for wide spread damage are introduced and summarized.This paper ends with discussion on the future research direction of fatigue life prediction method.更多还原