Study On The Fretting Behavior Of Interference Fit Surfaces Of Wheel Set In The High-speed Heavy-duty Train Running Process

The total weight of the train being supported by wheel set, so it is the place where the most prone to injury. The load and speed of high speed train is than the average locomotives, therefore the vibration, torsional, friction, and so on also can become more complex in the running process. For being interference fit connection of the wheel, so the interference fit surface stress is very large. In addition because of the surface roughness, When the wheel and axle interface tiny slip occurs, wheel set surface stress distribution is more complicated. So is very necessary to research the train wheel across interference fitting surface micro behavior. It can not only ensure the train safety and stable running, also has important significance for understanding and deepen the researches on the mechanism of the fretting fatigue damage.The research object of this paper is the interference fit surface of the wheel set of high speed heavy-duty train. Most of previous scholars use static or rotating small-angle’s method to analyze, when solving the problem of stress distribution on interference fit surface of wheel set. On this basis, this paper improved the wheel to the movement of the process. This paper simulated the process of high-speed heavy-duty train’s wheel set running one revolution in orbit with finite element simulation method. The problem of stress distribution on wheel set interference fit surface in the process of rotation was solved and analyzed the main reasons to produce micro damage on wheel set interference fit surface;Secondly according to the result of finite element simulation, this paper analyzed the regularity of load, the amount of interference and transverse force to the interference fit surface’s stress distribution. Also there was a research on interference fit of micro slip quantity’s distribution;Finally, by using finite element simulation method, author simulated the process of rough surface contact and sliding process on the basis of fractal theory and studied the wheel set interference surface stress change rule, when the surface roughness and micro slip amplitude changing.In this paper, the author simplified the wheel-set’s model, when studying interference fit surface. So the result of simulation and the actual have certain error. But this in-depth thinking provides a reference for the follow-up research about the fretting wear on high-speed train wheel set interference surface.