Experimental Stress Analysis. Instructor: Prof. K. Ramesh, Department of Applied Mechanics, IIT Madras. The course covers the basic aspects of experimental stress analysis that includes exhaustive treatment of the most versatile techniques like photoelasticity and strain gauges and also a brief introduction to the emerging techniques like digital image correlation. In addition it also provides the fundamental aspects of six different experimental techniques such as Moire, brittle coatings, holography, speckle methods, thermoelastic stress analysis and caustics.
(from nptel.ac.in)
Lecture 22 - Fringe Ordering in Photoelasticity
Concepts covered in this lecture: Importance of accurate evaluation of material stress fringe value, Global fringe thinning - summary, Comments on fringe ordering (contd.), Features of isochromatic and isoclinic fringe field, Positive and negative isotropic points, Role of principles of solid mechanics in fringe ordering, Identification of zeroth fringe order.