주행 차륜의 잔류응력 분포

초록

Recently, several wheel for freight car in running had experienced the fracture due to fatigue crack, overheat braking and other factors. During the braking process, the friction generated by the brake-shoe on the moving tread produces a heating rate. The heat generation at the braking shoe-wheel interface and heat transfer to the rail. Thermal fatigue due to repeated brake applications from high speed was identified as the primary contributor to the observed cracking. It is necessary to evaluate the residual stress in wheel tread. In the present paper, the distribution of residual stress of wheel using x-ray diffraction and FEM were investigated. The result shows that the distributions of residual stress are depend on the contact position of tread and the wheel rim is the most vulnerable to fracture.