Identification of Key Fatigue Welds of Bogie Welded Frame

Abstract

Based on the EN 13749-2011 standard and the master S–N curve method, the fatigue strength of the welded frame of the rail vehicle bogie is analyzed. First, based on the master S–N curve method, the influence of weld leg size and penetration on the failure mode of fillet welds is studied. The results show that the two failure modes of weld toe failure and weld throat failure when the fillet weld is not penetrated need to be considered at the same time, and only the weld toe failure needs to be considered for full penetration. Secondly, the fatigue load and fatigue conditions of the welded frame are determined based on the EN 13749-2011 standard, the cumulative damage of the frame welds is obtained according to the master S–N curve method, and the key fatigue welds of the frame are determined by the cumulative damage value. The cumulative damage value of the throat of the key fatigue welds is smaller than that of the weld toe. Among them, the cumulative damage of the annular fillet weld between the vertical plate of the motor hanger and the beam is the largest, with a value of 0.59.