随机振动载荷下大直径薄壁球形结构疲劳寿命分析

Analysis of Fatigue Life of Large-diameter and Thin-walled Spherical Structure Under Random Vibration Load

采用有限元方法和基于高斯分布与Miner线性累计损伤定律的三区间法,对随机振动载荷作用下大直径薄壁球形结构的疲劳寿命进行分析;并通过振动试验对分析结果进行验证。验证结果表明,该分析方法的误差满足工程设计要求,为随机振动载荷作用下大直径薄壁结构的疲劳寿命分析提供了一种可行的方法。

This paper uses finite element method（FEM） , three-interval method of the Gaussian and Miner linear cumulative dam-age law to analyze the fatigue life of the large - diameter and thin - walled spherical structure under the random vibration load. And then, the random vibration test is done to verify the correctness of the analytical method . The results show that the analytical method meets the requirement of the engineering design. The feasible method is provided for the fatigue life analysis of the large-diameter and thin-walled structure in the random vibration.