关键词: 对数正态, 结构, 可靠性, 疲劳寿命

Abstract: 　　Method of reliability computing for structural fatigue life (SFL) is developed. The formulae for computing the statistical parameters of the SVL under multiple loads are first derived based on the existed experimental results and Miner's linear cumulative damage theory. In these formulae the variation coefficients of the heat treatment of material, the measure of the structure and the external load amplitude peak are considered. Then the safety margin equation of the system of the SFL are presented. The reliability of the system is computed according to the safety margin equations and the statistics parameters of the SFL. The illustrative example is utilized to explain the practical application of this method, and the efficiency of this method is shown by the computing results.

Key words: Fatigue life, Logarithm normal, Reliability, Structure