引言结构构件的疲劳是一个具有很多影响参数的复杂过程。除了循环荷载的大小和性质以外,影响疲劳寿命的参数还包括应力集中效应、残余应力和平均应力的大小、材料的金相结构和环境的腐蚀性。一般的疲劳设计是采用半经验的方法,把结构构件的疲劳寿命作为用分析或实验确定的应力范围的函数,并且用 S-N(应力-循环数)曲线所表示的经验关系来考虑其他参数的影响。 Introduction Fatigue of structural components is a complex process with many influencing parameters. In addition to the size and nature of the cyclic load, parameters that affect fatigue life include stress concentration effects, magnitudes of residual and average stress, metallographic structure of the material, and the corrosivity of the environment. The general fatigue design is a semi-empirical method that uses the fatigue life of a structural member as a function of the stress range determined by the analysis or experiment, and considers the influence of other parameters using the empirical relationship represented by the SN (stress-cycle number) curve. .