空降自行火炮着陆过程平衡肘等效疲劳寿命分析

某空降型自行火炮着陆过程有车体姿态倾斜履带轮率先着地情况的发生，为了确定这样一次着陆冲击过程对履带系统关键部件平衡肘的损伤影响程度，建立了整炮的虚拟样机模型，通过对整炮虚拟样机模型进行空投着陆仿真以及同等路面行驶仿真，分别得到平衡肘上的动载荷谱。建立了平衡肘的有限元模型，对于着陆冲击时载荷较大的工况，采用应变疲劳分析方法ε－N进行疲劳寿命分析，对于行驶时载荷较小的工况，采用应力疲劳分析方法 S－N进行疲劳寿命分析，通过对两种工况下平衡肘的疲劳寿命对比，计算得到这样一次着陆冲击对平衡肘的损伤影响相当于火炮在同等路面上行驶了936 km。计算结果可为火炮的可靠性评估提供依据。

The Analysis of Equivalent Fatigue Life of the Balance Elbow for the Landing Impact Process of an Airborne of Self-mechanized Gun

It happens that the track system of a certain airborne type of self-mechanized gun can first touch the groud at the landing process owing to the tilt of the hull. In order to determine the degree of damage of the balance elbow,a key part of the track system in this process,the dynamic model of the gun was built. Then the landing simulation and driving simulation to the gun model were conducted re-spectively,getting the dynamic load spectrum on the balance elbow. With the finite element model of the balance elbow built,strain fatigue life analysis method is used for the large load at the landing con-dition;stress fatigue life method is used for the small load at the driving condition. Through a compari-son of the fatigue life of the balance elbow in the two conditions,it is worked out that the damage effect of such landing on the balance elbow is equivalent to the gun ’s running 936 kilometer on the same road. The calculation results can provide basis for the reliability evaluation of the gun.