In this paper, for a simulation model of a two-axle wagon with a wheelset having a deposit on one of its wheels, its dynamic impact on the rail was investigated as a function of the damage size, wagon speed, and mass for various track stiffness cases. Relative force increases for a wheel with a deposit and a flat spot were also compared.The simulations were performed in an environment. The main cause of deformation of wagon wheel rolling surfaces is the malfunction of the vehicle’s braking system or its improper operation. A wheelset that is completely or partially jammed in the brake shoes slides along the rail. This is most often manifested by noise, squealing, sparking, and smoke between the brake shoes and the rim or the tread of monoblock wheels, as well as between the rail and the wheel. The wheel-rail contacts heat up, and the material of the rolling surface becomes plasticized in these areas, which significantly accelerates its loss through indentation. If the indented material sticks to the undamaged rolling surface just behind the contact point, it will be rolled onto this surface after the sliding stops, causing it to be distorted. If, on the other hand, it sticks to the rail, the wheel will either roll it onto the rail or pick it up. In both cases, a flat spot will form on the wheel that “gives” the material, and a deposit will form on the wheel that “receives” the material. The deposit will grow due to the rolling in of material particles detached from the brake shoes during subsequent braking.
Another cause may also be improper braking or the use of a brake skid during wagon shunting. (…)
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Source: Logistyka Magazine 6/2011