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Research Papers: Elastohydrodynamic Lubrication

Influence of Roughness Parameters Skewness and Kurtosis on Fatigue Life Under Mixed Elastohydrodynamic Lubrication Point Contacts

[+] Author and Article Information
Xiao-Liang Yan

School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing 100081, China
e-mail: yanxiaoliang111@126.com

Xiao-Li Wang

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

Yu-Yan Zhang

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

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 8, 2014; final manuscript received April 18, 2014; published online May 6, 2014. Assoc. Editor: Dong Zhu.

J. Tribol 136(3), 031503 (May 06, 2014) (7 pages) Paper No: TRIB-14-1037; doi: 10.1115/1.4027480 History: Received February 08, 2014; Revised April 18, 2014

The numerical studies on the influences of surface parameters skewness and kurtosis on tribological characteristics under mixed elastohydrodynamic lubrication (mixed EHL) conditions are extended to fatigue life. Non-Gaussian rough surfaces are generated numerically with given autocorrelation function, skewness, and kurtosis. The results show that the maximum pressure increases as the skewness increases, however its variation with kurtosis is closely related to skewness. Similar trends to that of the maximum pressure are observed for the maximum von Mises stress. The fatigue life decreases as the skewness increases, however it undergoes apparent fluctuations with the increase of kurtosis. As the kurtosis increases, the influence of skewness on fatigue life becomes more significant, and vice versa.

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Figures

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Fig. 1

(a) A generated surface for Ssk = −1.0, Sku = 5.0. (b) Autocorrelation function of the generated surfaces for Ssk = −1.0, Sku = 5.0.

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Fig. 2

Flow chart for the calculation of fatigue life

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Fig. 3

Variation of the dimensionless average film thickness with Ssk and Sku

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Fig. 4

Variation of the contact load ratio Wc with skewness and kurtosis

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Fig. 5

Transient dimensionless pressure distributions for surfaces with different skewness (Sku = 4.0)

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Fig. 6

Transient dimensionless pressure distributions for surfaces with different skewness (Sku = 6.0)

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Fig. 7

Transient dimensionless pressure distributions for surfaces with different kurtosis (Ssk = −0.5)

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Fig. 8

Transient dimensionless pressure distributions for surfaces with different kurtosis (Ssk = 0.5)

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Fig. 9

Variation of the dimensionless maximum pressure Pmax with skewness and kurtosis

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Fig. 10

Effects of skewness and kurtosis on friction coefficient

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Fig. 11

Variation of the dimensionless maximum von Mises stress with skewness and kurtosis

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Fig. 12

Effect of skewness on relative fatigue life

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Fig. 13

Effect of kurtosis on relative fatigue life

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