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Research Papers: Hydrodynamic Lubrication

Improvement of Tribological Behaviors by Optimizing Concave Texture Shape Under Reciprocating Sliding Motion

[+] Author and Article Information
Hui Zhang

Key Laboratory of Education Ministry for
Modern Design and Rotor-Bearing System,
Xi'an Jiaotong University,
Xi'an 710049, China;
MBE Department,
City University of Hong Kong,
Hong Kong SAR 999077, China

Guang-neng Dong

Key Laboratory of Education Ministry for
Modern Design and Rotor-Bearing System,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: donggn@mail.xjtu.edu.cn

Meng Hua

MBE Department,
City University of Hong Kong,
Hong Kong SAR 999077, China

Kwai-Sang Chin

SEEM Department,
City University of Hong Kong,
Hong Kong SAR 999077, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 15, 2015; final manuscript received January 12, 2016; published online June 15, 2016. Assoc. Editor: Daniel Nélias.

J. Tribol 139(1), 011701 (Jun 15, 2016) (9 pages) Paper No: TRIB-15-1297; doi: 10.1115/1.4032971 History: Received August 15, 2015; Revised January 12, 2016

An analytical numerical model to optimize the shape of concave surface texture for the achievement of low friction in reciprocating sliding motion has been developed. The model uses: (i) average Reynolds equation to evaluate friction coefficient and (ii) genetic algorithm (GA) to optimize and obtain several preferable texture shapes. Analysis of distribution contour maps of hydrodynamic pressure gives the possible mechanisms involved. Moreover, experimental comparisons of tribological performances between the optimized and the circular textures were conducted to verify the simulation results. It is shown that surface textures of the elliptical and fusiform shapes can effectively enhance the load bearing capacity and reduce the friction coefficient compared with circular textures. The increase in hydrodynamic pressure for these optimized texture shapes is considered to be the major mechanism responsible for improving their tribological performance. Experimental results confirm that the elliptical-shaped textures have preferable tribological behaviors of low friction coefficient under the operating condition of light load.

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References

Figures

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Fig. 1

(a) Square array and (b) longitudinal cross-sectional profile of textures

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Fig. 2

Comparison of predictions of (a) the current model and (b) the results in the study of Patir and Cheng [22]

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Fig. 3

Characterization of an irregular texture shape

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Fig. 4

Computation flowchart of GA

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Fig. 6

Optimized (a) elliptical- and (b) fusiform-shaped textures under reciprocating sliding motion

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Fig. 7

Comparison of the tribological performances: ((a) friction, (b) bearing load, (c) friction coefficient, and (d) perimeter) among the circular textures, the elliptical-shaped textures, and the fusiform-shaped textures

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Fig. 8

Contour maps of hydrodynamic pressure distribution of (a) the circular textures, (b) the elliptical-shaped textures, and (c) the fusiform-shaped textures

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Fig. 12

Friction coefficient curve of elliptical surface textures (6 N, 5 Hz)

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Fig. 13

Friction coefficients of the circular and the elliptical-shaped textures varying with loads

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Fig. 9

Photographs and microscope images of (a) disk textured with circular dimples and (b) disk textured with elliptical dimples

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Fig. 10

Longitudinal profile of the elliptical-shaped texture after polishing

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Fig. 11

Reciprocating pin-on-disk test

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