WANG Pu,WANG Shuguo
JOURNAL OF VIBRATION AND SHOCK. 2018, 37(24): 72-79.
A numerical model was established, which can predict the wear distribution and development quantificationally.The influences of axle load, running speed and material hardness on rail wear distribution and development were studied systematically.This work solves the problems of lacking quantitative analysis in previous research.The major conclusions are as follows.① Influences of axle load: in the tangent section, with the axle load increasing, the rail wear are all distributed like saddle and the saddle feature becomes more obvious.The crest wear depth increases and the trough wear depth decreases.The wear loss tends to increase as a whole.In the curved section, the wear distribution is significantly different between the two rails.With the axle load increasing, the rail wear distribution characteristics remain almost the same, and the magnitude tends to increase.② Influences of speed: in the tangent section, with the vehicle speed increasing, the rail wear extends towards the inner side, and the wear depth increases over the distribution zone.In the curved section, with the speed increasing, the wear magnitude around the shoulder of outer rail decreases firstly and then increases, while the wear magnitude on the top of outer rail changes slightly.The wear magnitude of the inner rail decreases obviously.Compared with axle load, the influence of vehicle speed on wear is more significant.From the perspective of slowing down wear, priority should be given to developing heavy-axle load freight vehicle to expand the capacity of the heavy haul railway.Meanwhile, the speed of loaded vehicle should not be increased greatly.③ Influences of material hardness: Increasing the hardness will not influence the wear distribution zone and shape significantly, but can reduce the wear magnitude notably.However, excessive high hardness will accelerate fatigue damage and may not prolong the life-span of rail.