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Research Papers: Elastohydrodynamic Lubrication

Traction in EHL Line Contacts Using Free-Volume Pressure-Viscosity Relationship With Thermal and Shear-Thinning Effects

[+] Author and Article Information
Punit Kumar

Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803

M. M. Khonsari1

Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803khonsari@me.lsu.edu

1

Corresponding author.

J. Tribol 131(1), 011503 (Dec 04, 2008) (8 pages) doi:10.1115/1.3002331 History: Received July 07, 2008; Revised September 20, 2008; Published December 04, 2008

This paper investigates the traction behavior in heavily loaded thermo-elastohydrodynamic lubrication (EHL) line contacts using the Doolittle free-volume equation, which closely represents the experimental viscosity-pressure-temperature relationship and has recently gained attention in the field of EHL, along with Tait’s equation of state for compressibility. The well-established Carreau viscosity model has been used to describe the simple shear-thinning encountered in EHL. The simulation results have been used to develop an approximate equation for traction coefficient as a function of operating conditions and material properties. This equation successfully captures the decreasing trend with increasing slide to roll ratio caused by the thermal effect. The traction-slip characteristics are expected to be influenced by the limiting shear stress and pressure dependence of lubricant thermal conductivity, which need to be incorporated in the future.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 7

Comparison of traction results obtained from Eq. 27 and simulations for PAO100 oil

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Figure 8

Comparison of traction results obtained from Eq. 27 and experiments (33) for MIL-L-23699 mineral oil

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Figure 9

Effect of Roelands exponent z on the traction-slip characteristics

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Figure 1

Variation in traction coefficient with slide to roll ratio at uo=0.1 and 1 m/s

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Figure 2

Variation in maximum lubricant temperature with slide to roll ratio at uo=0.1 and 1 m/s

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Figure 3

Effect of thermal conductivity on traction-slip characteristics

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Figure 4

Comparison of traction-speed characteristics for different sets of shear-thinning parameters, n and Gcr

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Figure 5

Comparison of traction behavior at two different values of V∞R/VR

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Figure 6

Comparison of traction results obtained from Eq. 27 and simulations for PDMS oil

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