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TECHNICAL BRIEFS

Visualization and Measurement of Contact Area by Reflectivity

[+] Author and Article Information
Emanuel Diaconescu

 University of Suceava, Department of Mechanical Engineering, 1 University Street, 720225, Romaniaemdi@fim.usv.ro

Marilena Glovnea

 University of Suceava, Department of Mechanical Engineering, 1 University Street, 720225, Romaniamlg@fim.usv.ro

J. Tribol 128(4), 915-917 (Jun 19, 2006) (3 pages) doi:10.1115/1.2345421 History: Received February 25, 2004; Revised June 19, 2006

Surface deformations measured by laser profilometry in a contact model metal punch-sapphire window yield pressure distribution if the contact area is known. This paper advances a new method to assess this area by reflectivity. The contact model possesses higher reflectivity outside the contact area than inside, the step evidencing contact contour. A correction for interference effects is derived. Experimental results on circular Hertz contacts agree well with theoretical predictions.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Reflectivity of a three-layered medium

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Figure 2

Sketch of experimental setup

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Figure 3

Contact reflectivity for a normal load Q=1560N(a): 3D plot; (b): contour lines

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Figure 4

Theoretical (solid line) and experimental (dots) contact radius Q[N]: Normal load; a[mm]: Outer contact radius

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