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Characterizing Frictional Contact Loading via Isochromatics

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Abstract

Isochromatic patterns in the vicinity of frictional contacts furnish vital clues for characterizing friction. Though friction effects are evident in a diametrally loaded circular disk, three-point loading provides better results towards highlighting friction. In this paper, a new method of characterizing friction at loading contacts using photoelastic isochromatics patterns is presented. Location of isotropic points (IPs) formed in three-point and four-point loadings of circular disk is used as a main tool to quantify the friction component using theoretical analysis. Bifurcation of isochromatic fringe loops near the distributed loads is explained by the presence of anti-symmetric Hertzian shear traction in addition to Hertzian normal traction. The classical solution by Flamant for point load at the edge of half plane is used to derive stresses in circular disk for all required loading configurations. A semicircualr ring under three-point loading is examined using photoelasticity to understand the isochromatics pattern theoretically by considering normal and shear traction components at loaded regions.

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Acknowledgments

Authors would like to acknowledge Mr. G. Babu, the lab-technician for his help during experiments and Dr. M. Ramesh for his help while obtaining theoretical solutions.

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Authors and Affiliations

  1. Photoelasticity Laboratory, Department of Mechanical Engineering, Indian Institute of Science, Bangalore, 560012, India

    K. V. N. Surendra & K. R. Y. Simha

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  1. K. V. N. Surendra
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  2. K. R. Y. Simha
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Correspondence to K. V. N. Surendra.

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Surendra, K.V.N., Simha, K.R.Y. Characterizing Frictional Contact Loading via Isochromatics. Exp Mech 54, 1011–1030 (2014). https://doi.org/10.1007/s11340-014-9865-3

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  • DOI: https://doi.org/10.1007/s11340-014-9865-3

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