关键词: 车辆工程, 有限元模型, 时间载荷历程, 焊缝参数, 敏感性分析

Abstract: In order to overcome the problems of excess strength of base metal and insufficient strength of weld seam caused by the whole method in strength design of welded structure, a new finite element model of bogie frame with double axle and wide track width, including weld seam, was established. The static strength analysis was carried out by using the Optistruct module in Hyperworks, and the vehicle dynamics simulation model including the bogie was set up in the dynamic software Adams. According to the actual operation, the time load history of each key point for fatigue calculation was obtained by simulation. Considering the influence of notch stress and stress correction on the weld, the fatigue damage of the weld was analyzed, and the sensitivity of key weld parameters was analyzed. The results can be seen from the analysis that the influence of the weld penetration and weld thickness on the fatigue damage of the weld is decisive, and the influence of weld inclination angle is almost zero, and the effect of the notch size on the fatigue damage of weld is particularly critical.

Key words: vehicle engineering, finite element model, the time load process, weld parameters, sensitivity analysis