9th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems
Location: Chengdu, China
conformal contacts, contact areas, contact patch rolling contacts, switch blade, wheel rail force, wheel/rail contact forces, wheel/rail contacts
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The rail wear rate in turnouts is high compared to ordinary curves and straight track. This is because of the high lateral wheel-rail forces that cannot be compensated with cant and because of the changes in the rail profile at the switch blade and at the frog. However, to predict the rail wear from simulation is difficult. Many assumptions commonly made in wheel-rail contact calculation, such as a small planar contact patch and a constant spin creepage, are violated in wheel-rail contact in turnouts. This article introduces a new and more accurate method, WEAR, to calculate the wheel-rail contact forces and the corresponding wear rate. WEAR takes into account conformal contact by assuming that the geometry can be approximated with a quarter-space instead of a half-space, and takes into account the varying geometrical spin through the contact patch. It is shown that WEAR is capable of automatically treating two-point-contact occurring. The creep forces and the shapes of the contact areas calculated with WEAR look realistic.