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Research Papers: Elastohydrodynamic Lubrication

A Simple Model for Scuffing Risk Evaluation of Point Contact Under Mixed Lubrication

[+] Author and Article Information
Zhijian Wang, Xiaoyang Chen

School of Mechatronics Engineering
and Automation,
Shanghai University,
Shanghai 200072, China

Qingtao Yu

Beijing Aviation Manufacturing Technology
Research Institute,
Beijing 100024, China

Xuejin Shen

School of Mechatronics Engineering
and Automation,
Shanghai University,
Shanghai 200072, China
e-mail: shenxj@t.shu.edu.cn

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 3, 2017; final manuscript received October 12, 2017; published online December 20, 2017. Assoc. Editor: Wang-Long Li.

J. Tribol 140(3), 031502 (Dec 20, 2017) (11 pages) Paper No: TRIB-17-1172; doi: 10.1115/1.4038410 History: Received May 03, 2017; Revised October 12, 2017

This paper developed a point-contact mixed lubrication (ML) model, incorporating thermal effect, the asperity elasto-plastic deformation and the boundary film properties, to evaluate the relative severity of contact condition. Then, based on the integrity of boundary films and the sharp increase of the friction coefficient, the possibility of the occurrence of scuffing was evaluated. The model was verified with published experimental data. A systematic parametric analysis was made to investigate the influences of surface roughness, contact geometry, and the lubricant properties on contact performance. The results suggest that low surface roughness and high-quality boundary film can effectively improve the scuffing resistance under current operating conditions, while high-viscosity oil and large-radius curvature are not as much effective especially when the components work under high-sliding and high–temperature conditions.

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Figures

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Fig. 1

Geometry and coordinates of elliptical contact

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Fig. 2

Sketch of multiple layers of surface films

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Fig. 3

Flowchart of numerical solution

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Fig. 4

Comparison of theory and experiments with different sliding velocities

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Fig. 5

Comparison of the Masjedi's model and the current model: (a) predicted film thickness from Masjedi's model and (b) predicted film thickness from the current model

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Fig. 13

Influences of load on friction coefficient in different reaction film μr

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Fig. 6

Influences of surface roughness on the contact performance

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Fig. 7

Influences of load on friction coefficient in different roughness

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Fig. 8

Influences of different curvature radius on the contact performance

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Fig. 9

Influences of load on friction coefficient in different curvature radius

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Fig. 10

Influences of different viscosity on the contact performance

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Fig. 11

Influences of load on friction coefficient in different viscosity

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Fig. 12

Influences of reaction film μr on the contact performance

Tables

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