A Transient Finite Element Model to Simulate the Physical Mechanisms of High-speed Wheel/rail Rolling Contact on a Rail Welding Joint

Miao Yu, Weidong Wang, Jinzhao Liu
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Abstract

In order to study the influences of defective rail welding joints on wheel/rail interaction, a transient finite element model of a high-speed train passing over rail welding joints is presented on the basis of field measurements. Focusing on the physical mechanisms differences of wheel/rail rolling contact on welding joints with varying rail straightness at rolling speeds of up to 400 km/h, this model takes vehicle/track system dynamics and wheel/rail elastic–plastic deformations into account. The defective thermite welding joint with short wave irregularity easily leads to rail nucleus flaw with residual stress. When the running speed is over 250km/h,the maximum value of wheel/rail vertical force at welding joint has a basic trend of a bilinear increase with the increase of running speed and the unevenness of the welding joint. There is a phase difference between the maximum contact force and the peak joint irregularity. When the high-speed railway operation management standard is 250~350km/h, the short wave irregularity at rail welding joint with over 0.3mm straightness should be grinded.
钢轨焊接接头高速轮轨滚动接触物理机制的瞬态有限元模拟
为了研究钢轨焊接接头缺陷对轮轨相互作用的影响,在现场实测的基础上建立了高速列车通过钢轨焊接接头的瞬态有限元模型。该模型考虑了车辆/轨道系统动力学和轮轨弹塑性变形的影响,重点研究了在高达400 km/h的滚动速度下,不同轨道直线度下轮轨在焊接接头上滚动接触的物理机制差异。具有短波不规则性的缺陷铝热焊接接头容易产生残余应力的轨核缺陷。当运行速度大于250km/h时,焊接接头处轮轨垂直力最大值随运行速度的增加和焊接接头不均匀度的增加基本呈双线性增加的趋势。最大接触力与接头不平整度峰值之间存在相位差。当高速铁路运营管理标准为250~350km/h时,应对直线度大于0.3mm的钢轨焊接接头处的短波不平整进行打磨。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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