Analysis on the Characteristics of Wheel/Rail Rolling Contact under Different Friction Coefficient

According to LMA tread wheelset with the diameter of 860 mm and 60 kg·m-1 rail,the finite element software ABAQUS was adopted to construct 3D wheel/rail rolling contact finite element model.The model was solved by the parallel computing platform of cluster logical structure and the characteristics of wheel/rail rolling contact under different friction coefficient was analyzed.The results show that the friction coefficient has little influence on the size of the contact patch area,Mises stress value and the normal contact stress in the contact zone.The adhesion area of the contact patch,the horizontal and the vertical shear stress in the contact zone increase along with the increase of the friction coefficient,and the location approaches to the surface of the contact zone.Under the action of the same traction torque,the longitudinal shear stress between wheel and rail significantly increases as the friction coefficient increasing.The longitudinal component of the friction vector in the contact patch also increases along with it.The longitudinal components of the wheel/rail friction and the resultant moment around the origin change obviously too,and the maximum increase amplitude exceeds 30%.The spin torque also increases and its center point in the contact patch moves forward along the direction of traction.