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Research Papers: Elastohydrodynamic Lubrication

Effects of Texture Orientation on the Mixed Thermal Elastohydrodynamic Lubrication and Fatigue Life in Point Contacts

[+] Author and Article Information
Xiao-Liang Yan, Xiao-Qiong Du, Fen Qin

AVIC Qing'an Group Co., Ltd.,
Xi'an 710077, China

Yu-Yan Zhang

College of Mechanical and Electronical
Engineering,
Nanjing Forestry University,
Nanjing 210037, China
e-mail: zyy1988111@163.com

Guo-Xin Xie

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 11, 2018; final manuscript received May 27, 2018; published online July 24, 2018. Assoc. Editor: Wang-Long Li.

J. Tribol 141(1), 011501 (Jul 24, 2018) (11 pages) Paper No: TRIB-18-1065; doi: 10.1115/1.4040474 History: Received February 11, 2018; Revised May 27, 2018

Predicting the mixed thermal lubrication performance and fatigue life of point contact components becomes more and more important with the increasing demand for the load capacity of machinery. To achieve this, a deterministic mixed thermal elastohydrodynamic lubrication (TEHL) model in point contacts considering surface roughness is developed in this study. This model is capable of determining the pressure and temperature under different lubrication regimes from mixed to full-film lubrication. Then, the established model is extended to the subsurface stress and fatigue life predictions. Numerical simulations are conducted to analyze the lubrication characteristics and fatigue life for the three-dimensional (3D) sinusoidal surfaces with variable directions. Results show that increasing entraining velocity contributes to the reduction of pressure fluctuation and prolongation of fatigue life. However, the resulting temperature increases with the entraining velocity. As for the influence of lubricant viscosity, increasing it prolongs the fatigue life, especially under mixed TEHL conditions. What's more, the effect of rough surface texture feature on fatigue life has a close relationship with the lubrication regime.

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Figures

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Fig. 1

Schematic of sinusoidal rough surface with variable direction angle

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Fig. 6

Effects of entraining velocity on the maximum temperature

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Fig. 3

Pressure distribution at y¯=0 for four different entraining velocities

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Fig. 4

Film thickness distribution at y¯ = 0 for four different entraining velocities

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Fig. 5

The maximum temperature distribution at y¯ = 0 for four different entraining velocities

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Fig. 2

Flowchart of mixed TEHL and fatigue life calculation

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Fig. 8

The effect of lubricant viscosity on the contact load ratio Wc and the contact area ratio Ac (ue = 0.02 m/s, pH = 0.8 GPa)

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Fig. 9

Pressure distributions for three different ambient viscosities of lubricant (ue= 0.02m/s, pH = 0.8 GPa)

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Fig. 10

Temperature distributions for three different ambient viscosities of lubricant (ue = 0.02 m/s, pH = 0.8 GPa)

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Fig. 11

Pressure distributions for three different ambient viscosities of lubricant (ue = 0.5m/s, pH = 0.8 GPa)

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Fig. 12

Temperature distributions for three different ambient viscosities of lubricants (ue = 0.5 m/s, pH = 0.8 GPa)

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Fig. 13

Influence of ambient viscosity of lubricant on the maximum pressure

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Fig. 7

The effect of entraining velocity on fatigue life at different loads

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Fig. 16

Dimensionless pressure distributions for three different orientation angles θ

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Fig. 17

Effects of texture direction on the maximum pressure and minimum film thickness

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Fig. 14

Influence of ambient viscosity of lubricant on the maximum temperature

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Fig. 15

Effect of lubricant viscosity on relative fatigue life

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Fig. 20

Dimensionless subsurface stress distribution for three different orientation angle θ (ue = 0.015 m/s)

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Fig. 21

The effect of texture orientation on fatigue life

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Fig. 18

Effects of texture direction on the contact load ratio Wc and contact area ratio Ac

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Fig. 19

The effect of texture orientation on dimensionless maximum temperature Tmax

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