Abstract: In order to study the contact wear of the fixed frog of the turnout after the wheel set of the rail vehicle passes through the wear, a full-scale wheelset fixed frog test bench was built to test the wheelset passing through frog. According to the test results of wheelset crossing contact position, five typical contact positions were selected to establish the elastic-plastic contact model of wheelset fixed frog, Through the finite element simulation calculation, the contact spot and equivalent stress between the wheel and fork are analyzed. According to the wheel and fork test, when the vehicle wheelset passes through the fork in the forward direction (from the center rail end to the wing rail end), the wheel set contacts with the center rail wing rail at the same time from 225 mm to 237 mm away from the theoretical tip; From the finite element calculation, it can be seen that the equivalent stress of frog point rail is very large, which is easy to cause serious wear; In the process of wheelset crossing, the vertical displacement will decrease obviously, and the smaller the crossing speed is, the larger the relative decrease value of vertical displacement is; However, the contact area between the wheel set and the center rail is much smaller than that of the wing rail, so the wear of the center rail of the fixed frog is more serious than that of the wing rail; The finite element calculation is consistent with the experimental results, which provides an effective test method for reducing frog wear.

Key words: fixed frog, experimental study, vertical displacement, finite element method, abrasion