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Research Papers: Elastohydrodynamic Lubrication

A Parametric Study on Fatigue Life for Mixed Elastohydrodynamic Lubrication Point Contacts

[+] Author and Article Information
Xiao-Liang Yan

e-mail: yanxiaoliang111@126.com

Xiao-Li Wang

e-mail: xiaoli_wang@bit.edu.cn

Yu-Yan Zhang

e-mail: zhangyuyan@bit.edu.cn
School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing, 100081, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received November 20, 2012; final manuscript received April 24, 2013; published online June 6, 2013. Assoc. Editor: Dong Zhu.

J. Tribol 135(4), 041501 (Jun 06, 2013) (8 pages) Paper No: TRIB-12-1207; doi: 10.1115/1.4024303 History: Received November 20, 2012; Revised April 24, 2013

The lubrication characteristics and fatigue life are numerically analyzed under full film and mixed lubrication regimes, in which the three-dimensional sinusoidal surfaces with changeable wavelengths in x and y directions are used, the geometry changes of the contact areas are described by the various ellipticity, and the non-Newtonian flow of lubricant is described by the sinh-law rheology model. The results show that the influences of characteristic shear stress, wavelength ratio, and ellipticity on lubrication characteristics and fatigue life are remarkable. The effect of surface topography on lubrication characteristics has a close relationship with speed. Increasing the ellipticity and decreasing wavelength ratio and characteristic shear stress can prolong the fatigue life.

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Figures

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Fig. 1

Flow chart for the calculation of fatigue life

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Fig. 2

Pressure and film thickness results in comparison with those from literature [35]

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Fig. 3

Comparison of subsurface stress with literature [26]

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Fig. 4

Effects of characteristic shear stress on the dimensionless average film thickness and contact load ratio

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Fig. 5

Effect of characteristic shear stress on friction coefficient

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Fig. 6

Effect of characteristic shear stress on fatigue life

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Fig. 7

Effects of wavelength ratio on the dimensionless average film thickness and contact load ratio

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Fig. 8

Surface topography contour for three typical sinusoidal surfaces

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Fig. 9

Transient dimensionless pressure distribution for three typical sinusoidal surfaces

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Fig. 10

Transient dimensionless subsurface stress distribution for three typical sinusoidal surfaces (y = 0 plane)

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Fig. 11

Effect of wavelength ratio on the dimensionless average pressure

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Fig. 12

Effect of wavelength ratio on fatigue life

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Fig. 13

Effect of ellipticity on film thickness

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Fig. 14

Pressure and film thickness in the y = 0 plane

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Fig. 15

Pressure and film thickness in the x = 0 plane

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Fig. 16

Pressure distribution for three different ellipticity

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Fig. 17

Effect of ellipticity on the dimensionless average pressure

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Fig. 18

Effect of ellipticity on friction coefficient

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Fig. 19

Effect of ellipticity on the fatigue life

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