EXPERIMENTAL STUDY ON THE FATIGUE STRENGTH OF THE BOGIE FRAME FOR TILTING RAILWAY VEHICLES

초록

Bogie frame is the most important structure in a railway vehicle, as it is to support and to transmit various static and dynamic forces. To ensure the fatigue strength of bogie frame, the loading condition should be correctly defined and its design should be verified by fatigue test as well as static test. This paper shows the experimental study to evaluate the fatigue strength of a bogie frame for Korean tilting train, which is now under development. The various load cases were estabilished based on the international standard (UIC615-4) and the special tilting load case, which is unique in the tilting train, was derived by dynamic analysis and logical assumption of operation under worst tilting condition. The experimental study was conducted by means of two ways, both static and fatigue loading test. Through the static load test, the safety against fatigue was assessed using Goodman diagram of the material used. The fatigue load test was carried out up to 10x106cycles. The fatigue strength was assessed by fatigue crack inspection by means of NDT test at the at stage of 6x106cycles and 10x106cycles.