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Research Papers: Mixed and Boundary Lubrication

On the Modeling of Quasi-Steady and Unsteady Dynamic Friction in Sliding Lubricated Line Contact

[+] Author and Article Information
H. Sojoudi

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

M. M. Khonsari1

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

1

Corresponding author.

J. Tribol 132(1), 012101 (Nov 11, 2009) (9 pages) doi:10.1115/1.4000272 History: Received March 12, 2009; Revised August 27, 2009; Published November 11, 2009; Online November 11, 2009

A simple but realistic dynamic friction model for the lubricated sliding contact is developed based on decoupling the steady and unsteady terms in Reynolds equation. The model realistically captures the physics of friction behavior both when speed is increased unidirectionally or when operating under oscillating condition. The model can simulate the transition from boundary to mixed to full film regimes as the speed is increased. Two different classes of simulations are performed to show the utility of the model: the so-called quasisteady, where the sliding velocity is varied very slowly, and the oscillating sliding velocity, where the friction coefficient exhibits a hysteresis type behavior. Both categories of simulation are verified by comparing the results with published experimental data.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Schematic representation of an unsteady EHL contact; (b) equivalent system of (a) (KD=KD1+KD2); (c) equivalent system of (a) and (b) (1/Keq1=1/KD1+1/Ka and 1/Keq2=1/KD2+1/Kh)

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Figure 2

Friction coefficient as a function of the Sommerfeld number (experiment versus quasisteady and steady simulations FT=667 N and μ0=0.0815 Pa s)

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Figure 3

Friction coefficient as a function of the Sommerfeld number (load effect μ0=0.0815 Pa s)

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Figure 4

Friction coefficient as a function of the Sommerfeld number (viscosity effect FT=667 N)

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Figure 5

Friction coefficient as a function of the Sommerfeld number (surface roughness effect FT=500 N and μ0=0.1 Pa s)

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Figure 6

Friction coefficient as a function of velocity (load effect-experiments and simulations results; f=1 Hz and μ0=0.322 Pa s)

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Figure 7

Friction coefficient as a function of velocity (viscosity effect-experiments and simulations results; FT=250 N and f=5 Hz)

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Figure 8

Friction coefficient as a function of velocity (oscillating frequency effect FT=200 N and μ0=0.3 Pa s)

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Figure 9

Friction coefficient as a function of velocity (surface roughness effect FT=180 N, μ0=0.2 Pa s and f=5 Hz)

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