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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Visualization and Measurement of Contact Area by Reflectivity
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Diaconescu, E., and Glovnea, M. (June 19, 2006). "Visualization and Measurement of Contact Area by Reflectivity." ASME. J. Tribol. October 2006; 128(4): 915–917. https://doi.org/10.1115/1.2345421
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