Asian Journal of Physics Vol. 34, Nos 7 & 8 (2025) 483-491

Measurement of coupled photoelastic isochromatic and isopachic fringes using numerical analysis

Binu P Thomas1,2 and C S Narayanamurthy3

1Department of Aerospace Engineering, Indian Institute of Space Science and Technology, Thiruvananthapuram-695547, Kerala, India

2Experimental Mechanics Division, Vikram Sarabhai Space Center, Thiruvananthapuram-695022, Kerala, India

3Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram-695547, Kerala, India

Dedicated to Prof Kehar Singh on the occasion of his 84th Birthday on July 3, 2025

Photoelastic isochromatic (σ1 − σ2), and isopachic (σ1 + σ2) fringes are normally coupled whenever the stress induced birefringent materials are recorded using ether optical polariscope or holographic photoelasticity methods. This is due to non-localization of these fringes at a particular plane (where phases remain constant). Also, the isochromatic and isopachic fringes are coupled and inseparable. To solve, this we propose a new numerical method using Finite Element Method (FEM) analysis and Matlab programming for separately detecting isochromatic and isopachic fringes of an epoxy resin made up of Araldite CY230 cured with hardener Aradur HY951 in the ratio 10:1. © Anita Publications. All rights reserved.
Doi: XXX
Keywords: Isochromatic, Isopachic, Double exposure holography, Birefringent etc.

Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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