鉄道台車枠の裏波溶接部における疲労強度評価

抄録

The fatigue strength of back-side welded joints of railway bogie frames has not been clarified. Therefore, three-point bending fatigue tests on T-joint specimens were conducted. In the case of fatigue fracture initiation at the weld toe, the fatigue strength of the back-side welded joint was almost equal to that of the as-welded joint with the same weld toe radius. Moreover, finite element analysis was also conducted to evaluate the fatigue failure initiating at the root area. It was found that the stress intensity factor of the nonwelded area was almost constant at its different lengths, and the fatigue strength of the back-side welded joint did not decrease significantly, even at the nonwelded area.