基于刚弹耦合模型的薄壳车体危险点疲劳计算

Fatigue Assessment of Risk Point on Thin-Shelled Hull Based on the Rigid-Flex Coupled Model

摘要: 本文以某型履带式装甲车为例，采用时域方法针对薄壳装甲车体在使用过程中的疲劳寿命问题进行了分析与计算。本文采用整车刚弹耦合的动力学建模仿真方法，建立并验证了整车刚弹耦合模型，通过模拟薄壳装甲车辆任务剖面的行驶工况，得出车辆各点载荷的时域信号。综合分析各工况的车辆动力学仿真结果找出了薄壳车体的疲劳危险点。在获取危险点动态载荷的基础上，采用时域方法进行了疲劳寿命计算，得出任务剖面下该危险点出现疲劳破坏的里程数约为37,050公里。

Abstract: Taking the armored vehicle as example, this paper focused on the fatigue assessment problem occurred in the application of the thin-shelled armored vehicle by using time domain methods. This paper took use of rigid-flex coupled dynamic modeling method to build and verify the vehicle model. Depending on the mission profile, the load time his- tory was gained by simulating. Through analyzing the simulation results, the dangerous points on the hull were figured out. On the basis of accessing the dynamic loads of the dangerous point, through using time domain method, the load spectrum was built up to do the fatigue calculation. The result showed that fatigue problem will occur at the dangerous point when the driving distance was about 37,050 kilometers under the mission profile.