| Although railway has a important roll in promoting economic development and providing convenient for people's life , rolling contact fatigue and wear has being become more and more severe, accompanied by increased train speed and load, Investigating of the formation mechanism and influencing factors of rail rolling contact fatigue wear would help to bring enormous economic benefit and decrease breakage of rail.The effects of lateral,yaw motion,curve radius and axle load on wheel/rail was investigated with numerical methods on the basis of the theory of Non-Hertz rolling contact and CONTACT, and rail rolling contact fatigue of rail steel have been studied by using JD-1 rail-wheel tribology simulating machine, based on abundant literature research of rolling contact fatigue and an application project of railway. The effects of material ,load and curve radius of rolling contact fatigue have been focused on particularly. All work was aime to research the method on using friction work of wheel/rail to predict wear volume of rail. Main conclusions are drawn as follows:(1) The load is an important factors to effect rail wear normal pressure and friction of wheel/rail are increasing accompanied by the load increasing ,which result to make rail wear become severer.(2)The curve radius is another important factors to effect rail wear , when the curve radius becomes litter, the longitudinal creep forces of wheel/rail contact areas becomes bigger ,at the same time the friction of wheel/rail increasing quickly. Comparing with the date of rail wear volume tested by simulation experiment, it is indicated the rail wear is severer in litter curve radius and wear morphology changes too.(3)The longitudinal creep forces of wheel/rail contact areas decreases accompanied by yaw angel increases. Because the tangential force on wheel/rail contact areas has became saturated ,soψ≥0.3°,the lateral creep forces is approximately equal to spin creep moment and the maximum shear stress also approximately equal to von Mises ,which there is not relationship to curve radius ,but the normal pressure have an effect on them... |
