표면제거에 따른 철도차량 차륜의 잔류응력평가

Railway wheels and axles belong to the most critical components in railway vehicles. The service conditions of railway vehicles became more severe in recent years due to the increase of speed. Therefore, a more precise evaluation of wheelset life and safety has been requested. The residual stress on wheel is formed during the manufacturing process which includes a heat treatment, and then is changed by contact stress developed by wheel/rail contact and thermal stress induced by braking. Since the wheel is designed to maintain a constant thickness up to a certain limit for the reprofilling process which requires contact surface removal, wheel surface thickness is reduced by surface removal and wear over the life of a wheel. The residual stress of contact surface is redistributed due to surface removal and thickness variation. The objective of this paper is to estimate the variation and magnitude of the residual stress of railway wheel according to surface removal.