Digital image analysis around isotropic points for photoelastic pattern recognition

Kamadi Vara Naga Surendra; K. R. Yogendra Simha

doi:10.1117/1.OE.54.8.081209

9 June 2015 Digital image analysis around isotropic points for photoelastic pattern recognition

Kamadi Vara Naga Surendra, K. R. Yogendra Simha

Author Affiliations +

Optical Engineering, Vol. 54, Issue 8, 081209 (June 2015). https://doi.org/10.1117/1.OE.54.8.081209

Abstract

Fringe tracking and fringe order assignment have become the central topics of current research in digital photoelasticity. Isotropic points (IPs) appearing in low fringe order zones are often either overlooked or entirely missed in conventional as well as digital photoelasticity. We aim to highlight image processing for characterizing IPs in an isochromatic fringe field. By resorting to a global analytical solution of a circular disk, sensitivity of IPs to small changes in far-field loading on the disk is highlighted. A local theory supplements the global closed-form solutions of three-, four-, and six-point loading configurations of circular disk. The local theoretical concepts developed in this paper are demonstrated through digital image analysis of isochromatics in circular disks subjected to three- and four-point loads.

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Kamadi Vara Naga Surendra and K. R. Yogendra Simha "Digital image analysis around isotropic points for photoelastic pattern recognition," Optical Engineering 54(8), 081209 (9 June 2015). https://doi.org/10.1117/1.OE.54.8.081209

Published: 9 June 2015

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