钢轨涂油对小半径曲线段轮轨接触行为的影响OA

[Objective]In small-radius curved subway tracks,rail surface lubrication is commonly applied to reduce wheel-rail wear when trains pass through curves.However,lubrication decreases the adhesion coefficient between the wheel and rail,thereby affecting wheel-rail contact behavior.[Methods]To investigate the effects of rail lubrication methods on wheel-rail rolling contact behavior in low-adhesion areas of small-radius curved tracks,a three-dimensional transient finite element model of wheel-rail rolling contact under different lubrication conditions was established based on the explicit finite element method.The effects of different lubrication methods on wheel-rail contact states and rail surface wear were revealed.[Results]The results showed that rail surface lubrication significantly affected the tangential wheel-rail force.When both rails were lubricated,the longitudinal force decreased sharply,with reductions of 31.24％on the outer rail and 37.05％on the inner rail.When only one rail was lubricated,the other rail remained in a normal adhesion state and compensated for the loss of tangential wheel-rail force on the lubricated rail,resulting in a relatively small variation in tangential force.Rail lubrication had little effect on the contact patch area but significantly altered the stick-slip distribution within the contact patch.Furthermore,rail lubrication effectively reduced rail surface wear.Among them,dual-rail lubrication showed the most significant suppression effect on rail wear.At the calculation time,the maximum wear depths within the contact patches of the inner and outer rails decreased by 46.0％and 46.9％,respectively.[Conclusion]Dual-rail lubrication can effectively reduce rail wear and extend rail service life.