Abstract: The fatigue-life of a mechanical part is a very important index for its reliability．Leading an assesment of fatigue-life and reliability，which can be used further as an objective function in an optimal design of the part，is a meaningful thing．In this paper，an assessment of fafigue—life and reliability of a typical automobile part was conducted based on the theory of probability as a new application of pmbabilisfic and stochastic methods in mectmnical design．

Key words: mechanical part, fatigue-life, reliability assesment

摘要： 机械构件的疲劳寿命是其可靠性的一个重要指标．对构件进行疲劳寿命可靠性评定并在此基础上进行优化 设计(以疲劳寿命可靠性为目标函数)是一件值得探讨的工作．本文应用以概率论为基础的可靠性评定方法(以一 典型的汽车构件为例)来分析机械构件的疲劳寿命可靠性，为在机械设计中引入概率论与随机过程等数学方法作 了初步尝试．

关键词: 机械构件, 疲劳寿命, 可靠性评定