安定
焊接
有限元法
结构工程
接头(建筑物)
润滑
接触力学
材料科学
压力(语言学)
联轴节(管道)
磁道(磁盘驱动器)
机械
工程类
机械工程
复合材料
语言学
哲学
物理
作者
Zhaoyang Wang,Bing Wu,Jiaqing Huang,Yuqi Yang,Guangwen Xiao
出处
期刊:Industrial Lubrication and Tribology
[Emerald (MCB UP)]
日期:2023-12-21
标识
DOI:10.1108/ilt-09-2023-0309
摘要
Purpose The purpose of this study is to develop a transient wheel–rail rolling contact model to primarily investigate the rail damage under wet condition when the train passes through the welded joints. Design/methodology/approach The impact force induced by welded joints is obtained through vehicle–track coupling dynamics. The normal and tangential wheel–rail contact pressures were solved by elastohydrodynamic lubrication (EHL) theory and simplified third-body layer theory, respectively. Then, the obtained tangential pressure and normal pressure were applied to the finite element model as moving loads, simulating cyclic loading. Finally, the shakedown map and critical plane method were used to predict rolling contact fatigue (RCF) and the initiation of fatigue cracks. Findings The results indicate that RCF will occur and fatigue cracks are more prone to appear on the subsurface of the rail, specifically around 2.7 mm below the rail surface in the vicinity of the welded joint and its heat-affected zone. Originality/value The cosimulation of numerical model and finite element model was implemented. The influence of surface roughness and fluids was considered. In this model, the normal and tangential wheel–rail contact pressure, the stress and strain and the rail fatigue cracks were obtained under a rail-welded joint excitation.
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