Influence of rail gauge on wheel-rail contact behavior of metro line

被引：2
|
作者：
Chen R. [1 ,2 ]
Wen J. [1 ,2 ]
Yu H. [1 ,2 ]
An B. [1 ,2 ]
Xu J. [1 ,2 ]
Wang P. [1 ,2 ]
机构：
[1] Key Laboratory of High-speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu
[2] School of Civil Engineering, Southwest Jiaotong University, Chengdu
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2020年 / 51卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Contact behavior; Mechanical characteristics; Metro line; Rail gauge; Track gauge widening;
D O I：
10.11817/j.issn.1672-7207.2020.03.028
中图分类号：
学科分类号：
摘要：
In order to reveal the influence of rail gauge on wheel-rail contact characteristics, based on the wheel-rail contact geometry relationship, Kalker three-dimensional non-Hertzian rolling contact theory and its numerical program CONTACT, the profile of LM and CHN60 commonly used in metro vehicles in China was used. The effects of rail gauge on wheel-rail contact geometry parameters and wheel-rail contact mechanical properties were calculated. The results show that widening gauge leads to the wheel-rail contact point closer to the center of rail, reduces the rolling circle radius and contact angle of wheel-rail contact, increases the transverse displacement due to the sharp increase of radius and contact angle, and makes the rim not easy to be attached. Compared with the standard gauge, the lateral distribution of wheel-rail contact spot is narrower, the longitudinal distribution is wider and the contact area is reduced when the gauge is narrowed. When the gauge is widened to 1 437 mm, the adhesive area begins to appear in the contact spot. When the gauge is widened to 1 439 mm, the adhesive area in the contact spot increases significantly, and the contact spot area increases by 77%, reducing the sliding behavior of the wheel and rail. When the gauge changes from 1 433 to 1 439 mm, the normal stress and shear stress in the wheel-rail contact decrease significantly, and the maximum equivalent stress in the wheel-rail body also decreases significantly. In addition, the distribution range of the equivalent stress along the longitudinal direction becomes wider, and the influence range along the depth direction increases, which can avoid the concentration of the equivalent stress.The widening of gauge is beneficial to the matching of wheel-rail relationship of the metro line and to reduce the wear and fatigue damage between wheel and rail. © 2020, Central South University Press. All right reserved.
引用
收藏
页码：824 / 831
页数：7
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