Detection of Discontinuity in Map of Isoclinicsin Digital Photoelasticity

Abstract

This paper presents the automated method for detecting the discontinuity in map of isoclinics indigital photoelasticity. The method of detection involves the use of three phase maps, i.e., map of isoclinicsin the range 0 to +π/2, map of isoclinics in the range -π/4 to +π/4, and map of modulated intensity. Theresult obtained from the application of the method to the fringe patterns of a circular disk under three-radialcompressions and a split ring under eccentrically compression obtained on the basis of the phase-shiftingtechnique shows that the positions of discontinuities (isotropic points, singular points, and poles) can beeasily found with the use of the scanning process and the doublet and/or triplet functions.

Keywords : Digital Photoelasticity / Discontinuity / Isoclinics