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Research Papers

Numerical Modeling of Mixed Lubrication and Flash Temperature in EHL Elliptical Contacts

[+] Author and Article Information
Neelesh Deolalikar

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288neelesh411@purdue.edu

Farshid Sadeghi

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288sadeghi@ecn.purdue.edu

Sean Marble

Technology Lead, Sentient Corporation, 380 Hurricane Lane, Williston, VT 05495smarble@sentientscience.com

J. Tribol 130(1), 011004 (Dec 06, 2007) (20 pages) doi:10.1115/1.2805429 History: Received August 04, 2006; Revised June 27, 2007; Published December 06, 2007

Highly loaded ball and rolling element bearings are often required to operate in the mixed elastohydrodynamic lubrication regime in which surface asperity contact occurs simultaneously during the lubrication process. Predicting performance (i.e., pressure, temperature) of components operating in this regime is important as the high asperity contact pressures can significantly reduce the fatigue life of the interacting components. In this study, a deterministic mixed lubrication model was developed to determine the pressure and temperature of mixed lubricated circular and elliptic contacts for measured and simulated surfaces operating under pure rolling and rolling/sliding condition. In this model, we simultaneously solve for lubricant and asperity contact pressures. The model allows investigation of the condition and transition from boundary to full-film lubrication. The variation of contact area and load ratios is examined for various velocities and slide-to-roll ratios. The mixed lubricated model is also used to predict the transient flash temperatures occurring in contacts due to asperity contact interactions and friction. In order to significantly reduce the computational efforts associated with surface deformation and temperature calculation, the fast Fourier transform algorithm is implemented.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Flow through control volume

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Figure 2

Definition of leading and trailing edges for a bump in mixed lubrication

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Figure 3

Single hemispherical bump under mixed lubrication: (a) film thickness and (b) pressure

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Figure 4

Pressure and film thickness for a hemispherical bump under pure rolling condition at different time steps

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Figure 5

Pressure and film thickness for a hemispherical bump under pure rolling condition when the bump is located at the center of the Hertzian contact zone

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Figure 6

Contact load and contact area ratio for a hemispherical bump as a function of speed

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Figure 7

Pressure, film thickness, and contact index distribution for a rough surface (Rq=0.5μm) under a slide-to-roll ratio of S=0.2

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Figure 8

Film thickness for a rough surface along the rolling direction (Y=0) moving under pure rolling condition at different speeds

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Figure 9

Pressure distribution for a rough surface under mixed lubrication conditions illustrated for the plane Y=0 under different speeds (S=0.0)

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Figure 10

Variation of contact index with speed for different values of slide-to-roll ratios: (a) S=2.0 and (b) S=0.0

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Figure 11

Variation of contact load ratio and contact area ratio with speed for three different values of slide-to-roll ratios

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Figure 12

Comparison of flash temperature results with those of Tian and Kennedy (10)

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Figure 13

Temperature rise for the case of hemispherical bump under mixed lubrication conditions at different speeds

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Figure 14

Pressure distributions for a hemispherical bump under pure sliding conditions at different speeds

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Figure 15

Temperature rise for a rough surface under mixed lubrication pure sliding conditions at different speeds

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Figure 16

Pressure distribution for a rough surface under mixed lubrication pure sliding conditions at different speeds

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Figure 17

Contact index illustrating areas of solid and lubricated contact for a rough surface at different speeds

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Figure 18

Variation of pressure on the plane Y=0 at different speeds

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Figure 19

Variation of temperature rise for the plane Y=0 at different speeds

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Figure 20

Buildup of temperature on a rough surface at various time steps

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Figure 21

Variation of maximum temperature rise with sliding velocity

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