Special Section on Digital Photoelasticity: Advancements and Applications

Digital image analysis around isotropic points for photoelastic pattern recognition

[+] Author Affiliations
Kamadi Vara Naga Surendra, K. R. Yogendra Simha

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

Opt. Eng. 54(8), 081209 (Jun 09, 2015). doi:10.1117/1.OE.54.8.081209
History: Received February 3, 2015; Accepted May 5, 2015
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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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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Kamadi Vara Naga Surendra and K. R. Yogendra Simha
"Digital image analysis around isotropic points for photoelastic pattern recognition", Opt. Eng. 54(8), 081209 (Jun 09, 2015). ; http://dx.doi.org/10.1117/1.OE.54.8.081209


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