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Research Papers: Coatings & Solid Lubricants

Experimental Investigation on the Stick-Slip Phenomenon in Granular Collision Lubrication

[+] Author and Article Information
Karim N. Elkholy

Department of Mechanical Engineering, Louisiana State University, 2508 CEBA, Baton Rouge, LA 70803

M. M. Khonsari1

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

1

Corresponding author.

J. Tribol 130(2), 021302 (Mar 13, 2008) (7 pages) doi:10.1115/1.2842244 History: Received September 08, 2006; Received June 03, 2007; Revised December 17, 2007; Published March 13, 2008

An investigation on the nature of stick-slip associated with granular materials sheared between two parallel disks within the context of granular lubrication is presented. Experiments are carried out in an annular shear cell apparatus to demonstrate the effect of the stick-slip on the friction coefficient. Results are presented for the friction coefficient and the displacement as a function of the rotational speed and the applied load. The results reveal the occurrence of stick-slip at low speed and provided further evidence for the formation of granular lift between two disks undergoing sliding motion.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental apparatus

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Figure 2

Shear cell assembly

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Figure 3

Granular material and surface roughness

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Figure 4

Distinction between the stick-slip region and the sliding region. Case “A,” 5.8kPa; “B,” 6.5kPa; “C,” 7.2kPa; “D,” 7.8kPa; “E,” 8.5kPa; and “F,” 9.2kPa

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Figure 5

Effect of the rotational speed and the normal load on the friction coefficient. Case “A,” 5.8kPa; “B,” 6.5kPa; “C,” 7.2kPa; “D,” 7.8kPa; “E,” 8.5kPa; “F,” 9.2kPa

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Figure 6

Effect of the rotational speed and the normal load on the vertical displacement. Case “A,” 5.8kPa; “B,” 6.5kPa; “C,” 7.2kPa; “D,” 7.8kPa; “E,” 8.5kPa; “F,” 9.2kPa

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Figure 7

Effect of the normal load on the vertical displacement

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