关键词: 轮轨接触, 车轮磨耗, 半赫兹接触, Archard模型

Abstract: In order to compare the differences between Hertzian and semi-Hertzian contact algorithms in wheel-rail wear simulation processes, a dynamic model of CR400BF electric motor train unit(EMU) was established. Long-distance simulations were conducted based on Hertzian and semi-Hertzian contact algorithms(STRIPES), and the wear was calculated using Archard wear model. The calculated results of the two algorithms were compared respectively with the measured tread wear of 250 000 km. Results show that the wear amount and distribution of different rail profiles are obviously different. The shapes of the semi-Hertzian contact patch are obviously different under different wear mileages, the contact patch areas increase and the maximum contact stresses decrease gradually. At early stage of wear, the abrasion and distribution obtained by the two contact algorithms have little difference and are close to the measured results. But at later period, the abrasions of two kinds of algorithm are larger than the measured results， and the semi-Hertzian contact is more in line with the measured results than that of Hertzian contact. The reason is that with the increasing abrasion mileage, wheel/rail contact no longer meets the Hertzian contact hypothesis.

Key words: wheel-rail contact, wheel wear, semi-Hertzian contact, Archard model