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Research Papers: Mixed and Boundary Lubrication

On the Prediction of Running-In Behavior in Mixed-Lubrication Line Contact

[+] Author and Article Information
Saleh Akbarzadeh

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 132(3), 032102 (Jul 21, 2010) (11 pages) doi:10.1115/1.4001622 History: Received January 11, 2010; Revised April 08, 2010; Published July 21, 2010; Online July 21, 2010

A model is presented, which enables one to predict the running-in performance of the rolling/sliding surfaces subjected to mixed-lubrication line contact. The load-sharing concept was used, in which it is assumed that both the fluid film and the asperities contribute in carrying the imposed load. The plastic deformation of asperities during the running-in is taken into consideration. In the application of the load-sharing method, it is often assumed that asperity heights have a Gaussian distribution. This assumption has been relaxed in this model. Prediction results for the variation in the arithmetic average of asperity heights (Ra) during the running-in period for contact of two rollers are compared with published experimental data. Also presented are the results for the variation in wear volume, wear rate, and friction coefficient during the running-in period. The effect of surface pattern, speed, and load on the running-in behavior is studied. The steady-state wear rate for different surface patterns calculated from this model is compared with the wear rate predicted by the thermal desorption model, and the results are in agreement both in trend and magnitude. The effect of running-in on the Stribeck curve for different surface pattern is discussed.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the contact problem

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Figure 2

Schematic of plastic contact of asperities

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Figure 3

Different surface patterns: (a) transverse (Γ<1), (b) isotropic (Γ=1), and (c) longitudinal (Γ>1)(38)

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Figure 4

Comparison of experimental with predicted values

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Figure 5

Variation in scaling factors during running-in

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Figure 6

Effect of surface pattern on asperity scaling factor and wear volume

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Figure 7

Variation in wear rate with time for different surface patterns

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Figure 8

Comparison of wear rate from the current model and the thermal desorption model

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Figure 9

Evolution of surface profile during running-in for Case 1

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Figure 10

Variation in friction coefficient during running-in

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Figure 11

Roughness variation during running-in with different speeds (isotropic)

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Figure 12

Variation in friction coefficient and wear volume during running-in (isotropic)

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Figure 13

Variation in surface roughness and wear volume during running-in period (isotropic)

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Figure 14

Effect of running-in on Stribeck curve: (a) transverse Γ=0.2, (b) isotropic Γ=1, and (c) longitudinal Γ=3

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