轮轨试样表面粗糙度取向对油润滑下摩擦系数的影响

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轮轨试样表面粗糙度取向对油润滑下摩擦系数的影响
蔡宝春1, 蒋华臻1, 王文中2, 李正阳1, 王保安1, 杨兵1, 任志远1
1. 中国科学院力学研究所, 北京 100190;

 

2. 北京理工大学机械与车辆工程学院, 北京 100190

 
INFLUENCE OF SURFACE ROUGHNESS ORIENTATIONS ON FRICTION COEFFICIENT OF WHEEL/RAIL SPECIMEN IN OIL LUBRICATION
Cai Baochun1, Jiang Huazhen1, Wang Wenzhong2, Li Zhengyang1, Wang Baoan1, Yang Bing1, Ren Zhiyuan1
1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;

 

2. Mechanical and Vehicular Engineering College, Beijing Institute of Technology, Beijing 100190, China

 
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摘要 黏着力是列车安全与平稳运行的关键因素之一.最大黏着力与摩擦力有关,摩擦力的减小会导致黏着力的降低.表面粗糙度及其取向是影响摩擦系数的重要因素,然而,有关表面粗糙度取向对于混合润滑状态下摩擦系数的影响的研究结论似乎是矛盾的.用激光离散改性技术将车轮试样表面制备成具有菱形、纵纹、横纹3种典型的形貌,并且与不作激光离散改性处理的车轮试样作对比,用基于确定性模型的统一雷诺方程数值分析法和小比例尺度的轮轨试样摩擦学实验,得到的结论是:在油润滑状态下,激光表面形貌大幅提高摩擦系数,其中菱形对应的摩擦系数最大,纵纹与横纹的摩擦系数相差不大,摩擦系数的大小主要取决于由表面粗糙度取向决定的接触区内粗糙峰接触压力与总压力之比,侧流效应也是影响摩擦系数的重要因素,它主要取决于接触区内表面粗糙度的取向.
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Abstract:Adhesion is one of the key factors to maintain safety and stability of train running. Maximum adhesion is related to the friction. The decline of friction results in decrease of adhesion. In fact the friction coefficient mixed lubrication is not only greatly influenced by surface roughness, but also by roughness orientations. However, the previous investigations regarding the effect of roughness orientation on friction coefficient seem to be contradictory. In this paper,the three typical surface roughness orientations, i.e., longitudinal, transverse and rhombus were treated by laser discrete modification technology. The behavior of three patterns of roughness orientations under mixed lubrication were compared to those of without laser treatment. A numerical analysis based on deterministic model with unified Reynolds equation was adopted. Tribology tests with scaled wheel/rail specimens were carried out. It is concluded that the wheel surface with laser patterns greatly enhanced the friction coefficient comparing with the surface without laser pattern. The friction coefficient of rhombus pattern is the greatest one among that of the three laser patterns. The friction coefficient of longitudinal and transverse pattern is almost the same, but the former is a little higher than that of the latter. The friction coefficient is mainly depended on the ratio of asperity contact pressure to the total pressure in mixed lubrication. The orientation effect on friction coefficient is also determined by lateral flow which is highly depended on the geometry of contact region.
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收稿日期: 2016-03-28
中图分类号: TH117  
基金资助:国家自然科学基金(51275510)与国家重点基础研究发展计划(973)(2011CB711103)资助项目.
通讯作者:李正阳,副研究员,主要研究方向:金属材料的润滑与摩擦、磨损与疲劳等.E-mail:zyli@imech.ac.cn

 

E-mail: zyli@imech.ac.cn

引用本文:
蔡宝春,蒋华臻,王文中等. 轮轨试样表面粗糙度取向对油润滑下摩擦系数的影响[J]. 力学学报, 2016, 48(5): 1114-1125.
 
 
 
Cai Baochun,Jiang Huazhen,Wang Wenzhong et al. INFLUENCE OF SURFACE ROUGHNESS ORIENTATIONS ON FRICTION COEFFICIENT OF WHEEL/RAIL SPECIMEN IN OIL LUBRICATION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(5): 1114-1125.

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