不同焊缝简化方式下的多轴疲劳评估对比分析

Comparative analysis of multi-axis fatigue evaluation under different weld simplification methods

为研究仿真中不同焊缝截面几何形状对所形成的焊接应力的影响,文章基于DVS 1612:2014及EN 15085-3:2007标准,针对转向架制动座角焊缝设立了三角形截面与底部凹槽两种结构方式,通过结构组合建立不同的焊缝模型,并分别进行静强度校核和多轴疲劳评估。结果表明:有三角形截面的焊缝模型,其多轴材料利用度相对无三角截面的焊缝模型最大增加25%;有底部凹槽的焊缝模型,其多轴材料利用度相对无底部凹槽的焊缝模型最多减小13%,且制动座静强度及疲劳强度满足要求。

In order to study the influence of different weld section geometry on the welding stress formed in the simulation,based on the DVS 1612:2014 and EN 15085-3:2007 standards,two structural modes of triangular section and bottom groove are set up for the fillet weld of bogie brake seat.Different weld models are established through structural combination,and static strength check and multi-axis fatigue assessment are carried out respectively.The results show that the multi-axis material availability of the weld model with triangular section is about 25%ultimately higher than that of the weld model without triangular section.The multi-axis material availability of the weld model with bottom groove is about 13%ultimately lower than that of the weld model without bottom groove,and the static strength and fatigue strength of the brake seat meet the requirements.