Abstract: In order to study the worn problem of movable point frog of high-speed turnout, by use of CRH5 EMU wheel and No. 18 movable point frog profile with 60 kg/m rail, a three-dimensional wheel rail contact model was established to calculate elastic-plastic contact state between standard XP55 wheel and worn wheel and movable point frog of high-speed turnout at different positions. The research results show that the wheel rail contact state is affected by the wear degree and contact position. Compared with standard wheels, the transition section of worn wheels is relatively longer. Compared with the contact between the worn rear wheel and the movable point frog, the matching between the standard wheel and nose rail is unreasonable, which is more likely to cause stress concentration. The maximum equivalent stress generated by the contact between the standard and the worn rear wheel and the movable point frog exceeds the yield limit of the nose rail material, and the nose rail will produce plastic deformation, which will cause the movable point frog worn.

Key words: railway engineering; high-speed railway; wheel-rail matching; model test; movable point frog; finite element method

摘要： 为研究高速道岔可动心轨的磨耗问题，利用实测CRH5型动车组车轮及60 kg/m钢轨18号可动心轨型面，建立三维轮轨接触模型，对标准XP55型车轮和磨耗后车轮与高速道岔可动心轨在不同位置处的接触状态进行弹塑性计算。研究结果表明：轮轨接触状态受磨耗程度和接触位置影响，与标准车轮相比，磨耗车轮过渡区段相对延长；相较于磨耗后车轮与可动心轨接触，标准车轮与可动心轨匹配不合理，更易产生应力集中；标准和磨耗后车轮与可动心轨接触产生的最大等效应力均超过可动心轨材料的屈服极限，可动心轨均会产生塑性形变，从而造成可动心轨磨耗。

关键词: 铁道工程；高速铁路；轮轨匹配；模型试验；可动心轨；有限元