Static Contact Analysis of Worn-Wheel Profiles and 60N Rail of High-Speed Railway

Over time, the running of vehicles results in different degrees of wear on the wheel treads. To study the static matching characteristics between the worn wheel and the rail, the wheel-rail contact geometry relationship and non-Hertz rolling contact theory were used to analyse the effects of worn-wheel profiles on the wheel-rail contact geometry parameters and contact behaviour. The results were compared with those of CHN60 rail and analysed. The results indicate that when the lateral displacement of the wheel set is less than 4 mm, the degree of wear on the wheel is greater, and the lateral distribution width of wheel-rail contact points on the wheel is larger. The lateral distribution width of the wheel-rail contact points of 60N rail is significantly less than that of the CHN60 rail, thereby improving the vehicle's running stability. The wheel-rail wear index increases with the degree of wheel wear. The wheel-rail wear index of 60N rail is smaller, which improves the ability to maintain the wheel-rail profile. A greater degree of wheel wear corresponds to a greater surface rolling contact fatigue area. Compared with CHN60 rail, the number of cases located in the area of surface rolling contact fatigue of 60N rail is less, which can reduce the rolling contact fatigue damage under the same conditions.