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Characterization of friction at three contact pairs by photoelastic Isotropic point (IP)

Surendra, KVN and Simha, KRY (2015) Characterization of friction at three contact pairs by photoelastic Isotropic point (IP). In: International Conference on Experimental Mechanics, NOV 15-17, 2014, Singapore, SINGAPORE.

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Official URL: http://dx.doi.org/10.1117/12.2085529

Abstract

Friction coefficient between a circular-disk periphery and V-block surface was determined by introducing the concept of isotropic point (IP) in isochromatic field of the disk under three-point symmetric loading. IP position on the symmetry axis depends on active coefficient of friction during experiment. We extend this work to asymmetric loading of circular disk in which case two frictional contact pairs out of three loading contacts, independently control the unconstrained IP location. Photoelastic experiment is conducted on particular case of asymmetric three-point loading of circular disk. Basics of digital image processing are used to extract few essential parameters from experimental image, particularly IP location. Analytical solution by Flamant for half plane with a concentrated load, is utilized to derive stress components for required loading configurations of the disk. IP is observed, in analytical simulations of three-point asymmetric normal loading, to move from vertical axis to the boundary along an ellipse-like curve. When friction is included in the analysis, IP approaches the center with increase in loading friction and it goes away with increase in support friction. With all these insights, using experimental IP information, friction angles at three contact pairs of circular disk under asymmetric loading, are determined.

Item Type: Conference Proceedings
Additional Information: Copy right for this article belongs to the SPIE-INT SOC OPTICAL ENGINEERING, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
Keywords: Photoelasticity; Isochromatics; isotropic point; circular disk; three-point loading; asymmetry; friction; analytical solution
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 22 May 2015 09:16
Last Modified: 22 May 2015 09:16
URI: http://eprints.iisc.ac.in/id/eprint/51584

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