Analysis of Characteristics of Wheel /Rail Rolling Contact Based on Mixed Lagrangian /Eulerian Method

To overcome the long time consumption of the explicit finite element calculation of wheel /rail rolling contact,the mixed Lagrangian / Eulerian method is used to establish a wheel / rail rolling contact finite element model. Through this model,the elements of the wheel / rail contact region are refined,and the wheel / rail contact characteristics are investigated in trains ' starting,running,and braking conditions. The results show that under the different conditions,the maximum Mises stress,and the maximum contact stress,and the area of wheel / rail contact patches vary in the range of 2%,but the Mises stress distribution of the longitudinal section in the contact region and the longitudinal shear stress distribution vary greatly. Positions of the maximum Mises stress and the maximum longitudinal shear stress in starting and braking conditions are closer to the surfaces of wheel / rail than in free rolling. Especially it can be found that the size and direction of friction within the contact patch vary with different conditions,and pure sliding occurs when the friction reaches the limit between wheel and rail in the train traction and braking. In addition,the longitudinal friction force also varies within 2% when the train is in different speed grades.