Finite element simulations of wheel-rail impact response induced by wheel tread spalling of high-speed trains

被引：0
|
作者：
Wang J. [1 ]
Guo X. [1 ,2 ]
Jing L. [1 ]
Wang K. [1 ]
机构：
[1] State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu
[2] CRRC Qishuyan Institute Co. Ltd., Changzhou
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2022年 / 42卷 / 04期
关键词：
Finite element simulation; High-speed train; Impact response; Wheel tread spalling; Wheel-rail rolling contact;
D O I：
10.11883/bzycj-2021-0374
中图分类号：
学科分类号：
摘要：
Wheel tread spalling is one of the common forms of wheel out-of-roundness damage of railway vehicles. During the wheel-rail rolling contact process, the wheel tread spalling will circularly impact the rail, inducing an abnormal large dynamic wheel-rail interaction, which has a serious effect on the stability and safety of high-speed trains. In order to reveal the mechanism of dynamic wheel-rail interaction induced by wheel tread spalling of high-speed trains, a three-dimensional finite element model for the wheel-rail rolling contact was built using the commercial software LS-DYNA. The mechanical responses of the wheel-rail impact caused by the wheel tread spalling of high-speed trains were simulated via the implicit-to-explicit sequential solution. The response characteristics of the wheel-rail vertical/longitudinal contact forces, contact pressure, contact patch, adhesion-slip areas, speed distribution of rail surface nodes, and the stress/strain states during the wheel-rail impact process were analyzed. Meanwhile, the effects of key parameters such as train speed, spalling length and spalling depth on the wheel-rail impact responses were discussed. The results indicate that the wheel-rail vertical dynamic contact force caused by the wheel tread spalling first increases with the train speed and then decreases, and the maximum value appears at a train speed of 300 km/h, which can reach 1.35 times the quasi-static wheel-rail vertical contact force. The maximum wheel-rail longitudinal force fluctuates slightly with the increase of the train speed, and is about 1.25 times the steady wheel-rail longitudinal contact force. The maximum wheel-rail vertical contact force, tangential contact force, the maximum von Mises stress, and equivalent plastic strain of the wheel-rail are monotonically increase with the spalling length. The spalling depth has almost no effect on the wheel-rail contact force, the maximum von Mises stress and equivalent plastic strain of the rail, but has a significant effect on the maximum von Mises stress and equivalent plastic strain of the wheel. The obtained results can provide technical support for the optimal design of the wheel-rail system and the safety of the train operation. © 2022, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.
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