Contact relationship of wear wheel and curved rail

The wear wheel profile of JM3 type of SS4 locomotive and the profile of rail with small radius curve were measured by using wheel/rail instrument,and wheel geometric profiles were obtained by using spline curve fitting method.Five different degrees of wheel profiles were chosen,a 3D wheel/rail contact finite element model was built,and wheel/rail contact plaque areas and contact stresses were calculated.Calculation result indicates that when Ⅰ type wheel contacts with wear rail,contact plaque area is smallest,only 183 mm2.The maximum Von Mises stress is 1 459 MPa,and contact stress mainly concentrates wheel flange root.WhenⅡtype wheel contacts with wear rail,contact plaque area is 294 mm2.When Ⅲ type wheel contacts with wear rail,contact plaque area increases significantly.The maximum Von Mises stress is 1 137 MPa,contact stress distribution is relatively uniform,and flange wear slows down.When Ⅳ type wheel contacts with wear rail,the maximum Von Mises stress is 890 MPa,When Ⅴ type wheel contacts with wear rail,the maximum Von Mises stress is 953 MPa,but flange wear has reached limit state.1 tab,9 figs,12 refs.