燃油箱吊座焊缝的强度和疲劳有限元分析

对某内燃机车燃油箱吊座中T型焊接接头部位焊缝强度和疲劳进行有限元分析.在焊缝熔深为2,3和5 mm(全熔透)时,将吊座有焊缝和无焊缝时应力有限元计算结果与传统方法计算结果进行比较,结果表明:在焊缝全熔透时吊座整体最大应力小于传统方法计算的无焊缝时的最大应力,说明全熔透结构具有更好的连接性能.焊缝全熔透时焊缝处节点应力分布表明几何截面突变明显处的节点应力较大.疲劳计算结果表明该燃油箱吊座满足疲劳强度要求.

Finite element analysis on weld strength and fatigue of fuel tank bracket

The finite element analysis on the weld strength and fatigue of the T-type welded joints in a diesel locomotive fuel tank bracket is performed. When the penetration depth is 2, 3, and 5 mm(full penetration) respectively, the finite element calculation results of the stress of the bracket with or without weld are compared with the calculation results obtained by the traditional method. The results indicate that the maximum stress of the whole bracket in the full penetration model is smaller than that calculated by the traditional method in the model without weld, which show that the full penetration structure has better connection performance. When the weld is fully penetrated, the nodal stress distribution of the weld shows that nodal stress is larger in the geometrical sections with abrupt changes. The fatigue calculation results show that the fuel tank bracket can meet the fatigue strength requirement.