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Title:
轮轨试样表面粗糙度取向对油润滑下摩擦系数的影响
Alternative Title: INFLUENCE OF SURFACE ROUGHNESS ORIENTATIONS ON FRICTION COEFFICIENT OF WHEEL/RAIL SPECIMEN IN OIL LUBRICATION
Author: 蔡宝春; 蒋华臻; 王文中; 李正阳; 王保安; 杨兵; 任志远
Source: 力学学报
Issued Date: 2016
Volume: 48, Issue:5, Pages:1114-1125
Abstract: 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.
English 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 on 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.
Keyword: elasto-hydrodynamic lubrication ; surface topography ; rolling contact ; wheels/rails
Language: 中文
Indexed Type: CSCD ; EI
Correspondent Email: zyli@imech.ac.cn
WOS Keyword Plus: elasto-hydrodynamic lubrication ; surface topography ; rolling contact ; wheels/rails
ISSN: 0459-1879
Funder: 国家自然科学基金 ; 国家重点基础研究发展计划(973)
Rank: 蔡宝春, 中国科学院力学研究所, 北京 100190, 中国.; 蒋华臻, 中国科学院力学研究所, 北京 100190, 中国.; 李正阳, 中国科学院力学研究所, 北京 100190, 中国.; 王保安, 中国科学院力学研究所, 北京 100190, 中国.; 杨兵, 中国科学院力学研究所, 北京 100190, 中国.; 任志远, 中国科学院力学研究所, 北京 100190, 中国.; 王文中, 北京理工大学机械与车辆工程学院, 北京 100190, 中国.
CSCD ID: CSCD:5808805
Department: MAMYAG激光毛化技术
Classification: 二类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/59991
Appears in Collections:先进制造工艺力学重点实验室_期刊论文

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Recommended Citation:
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,2016-01-01,48(5):1114-1125.
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