The Experiment Study for Fatigue Strength of Bogie Frame of Beijing Subway Vehicle Under Overload Situation

Abstract

In this paper, a problem for safety of bogie frame of subway vehicle under overload situation has been discussed. Firstly, the structure of bogie frame and service condition are introduced to explain the reason caused fatigue failure. Then, the testing points are selected in terms of the structure of bogie frame, the characteristics of processing technique, load transfer path and the operation situation of subway vehicle. Based on them, the experiment for acquiring stress data during peak of service is done. After that, the process of fatigue analysis is presented with rainflow cycle counting method using the data above. From the Miner rule, nominal stress method and Goodman relation, the formula for fatigue strength assumed infinite life is obtained. Finally, the results of fatigue analysis according to the approach above is presented in the form of table. The research work provides guidance for maintaining the bogie frame.

Analysis on the fatigue cracks in the bogie frame

“…Subsequently, the fatigue fracture occurred in a large number of bogie's components [2][3][4][5][6][7]. In 2012, the cracks occurred in the motor bogie frames of Beijing subway vehicles, and the cracked location was mostly in the middle of the transom, where was the welding positions between transom and vertical stop, shown in Figs.…”