A Study On The Mechanism Of Wheel-rail Wear And Its Control

Nowadays world railways are developing towards high speed trains and heavy haulage, so some problems of wheel-rail relation is becoming more and more serious, such as rail corrugation resulting from wheel-rail wear, rail fatigue strength caused by rolling contact, derailment and so on. Every year these problems bring about heavy economic losses to international railway transport services.In this paper, the wheel/rail wear problem is analyzed and solved by using the finite element parametric quadratic programming method. The model is built according to the actual geometric relation. The Hertz assumption and the elastic-half-space assumption in the classical analytical or half-analytical method are completely avoided.In this paper, the 3D FEM models of cone-tread and worn-tread locomotive and vehicle wheels are firstly established, which come into contact with the rail of standard size. There hasn't been any more refined 3D FEM computation model of wheel/rail up till now. The elastic effect of crosstie and roadbed is also considered. Lots of the elastic contact problems and elastoplastic contact problems are computed. A lot of data such as the wheel/rail contact force; contact status and wheel/rail stress distribution are obtained. After detailed analysis of the computation results, some laws are obtained on how the structures of locomotive and vehicle and some applied parameters affect the performance of wheel/rail contact.According to several parameters which computed from test, such as the various kinds of load in wheel/rail system, the geometry sizes, the wheel/rail relative position, etc, the calculation of the elastic-plastic contact can be carried out in this project, and also, analyze the changing regularity overall according to the calculation result. The analysis focus on the mechanism which causing and developing the wear of wheel and rail. The effect and weight of the various parameters such as the wheel/rail load and relative position in the wear process is studied.The research method and computed results in this paper are very useful to solve problems of wheel-rail wear.