이동열원을 고려한 레일육성용접부의 잔류응력 평가

초록

Even though repairing welding has been adopted as a useful remedial process for high-speed railway, cracks were reported beneath weld surfaces under wheel-to-rail contact condition. In the present paper, effects of the repairing welding were examined to prevent unanticipated defects in the railway. An optimized numerical procedure was derived by taking into account moving heat source and applied to systematic finite element analyses in accordance with varying welding penetration depths. Maximum shear stresses as well as stress distributions were obtained and compared, which can be used as a technical basis to establish suitable corrective actions.