Abstract: Fatigue failures of welding bogie frames are critical issues when vehicles run at higher speeds. Traditionally, foreign welding standards are used for the design and evaluation fatigue strength of bogie frame as the reasons of inadequate fatigue performance data which are applicable to our own base materials and welding joints. To build database for rail vehicle industry becomes a necessary issue. The 16MnR butt joints were tested on RUMAL high frequency electromagnetism fatigue test machine. Median S-N and design S-N curves with 95% possibility of survival and 90% confidence level of joints were obtained by using group method and staircase method. Goodman-Smith fatigue limit diagram was obtained through 8 points method. All these data supply basic fatigue performance information for fatigue design and evaluation fatigue life of welding bogie frame.

Key words: Correctional Goodman-Smith diagram, Fatigue test, P-C-S-N curve, force balance model, Grasping force-closure, Biped-pole-climbing robot