Development Research on the Improved Fatigue Life Assessment Method of Yaw Damper Bracket Based on Trial-Run Data, Considering Welding Residual Stress

초록

The characteristics of fatigue behavior of yaw damper bracket was analyzed by figuring out various load conditions on the bogie parts and combining the stress on the yaw damper bracket by the load conditions. Towards this end, the structural analysis was carried out based on the deduced load and boundary conditions after conducting the analysis on load conditions based on trial-run data, and then the stress distribution of yaw damper bracket on the each load conditions were deduced, thereby the characteristics of fatigue behavior of yaw damper bracket on the bogie of train was analyzed by combining the deduced stress distribution. In particular the residual stress which can be occurred in welding operation was reflected in total fatigue life. The fatigue life assessment method suitable for yaw damper bracket of a railroad car is suggested.