基于非线性接触算法的设备连接强度及随机振动分析

Nonlinear Analysis of Device Connection Strength based on Contact Algorithm

以某列车底架上一牵引设备为例,将螺栓以六面体单元进行离散并施加一定的预紧力,在5个冲击载荷工况下以接触非线性方法对设备安装座及螺栓强度进行精确校核计算,并对结构进行优化,确认最终结构.基于此对结构进行随机振动疲劳分析,考察结构分别在纵向、横向、垂三个方向总共15 h随机激振载荷下结构的疲劳总损伤.结果显示:各结构件母材和焊缝总损伤均小于1,满足随机振动疲劳的要求.

Aiming at a traction device under the underframe,the bolts are meshed by hexahedral elements and,a certain pretension force is applied.Under five impact load cases,the strength is accurately calculated using contact nonlinear method,and the structure is optimized.Based on the structure,a random vibration fatigue analysis is performed,and the total fatigue damage of the structure under random excitation loads for a total of 15 hours in the longitudinal,transverse and vertical directions is assessed.The results show that the total damage of each structural part is less than 1,which meets the requirements of random vibration fatigue.