Showing papers by "K. Ramesh published in 1997"
TL;DR: In this paper, an over-deterministic least squares technique is proposed to evaluate the mixed-mode stress field parameters by the technique of photoelasticity, which leads to a very simple software where one can idependently increase the number of terms in Mode I or Mode II series depending on the specific problem requirement until the experimental fringes are correctly modelled.
143 citations
TL;DR: This paper investigates whether one or all of the image planes can be thought of as behaving like an optical filter: with the hardware used, the green channel is found to behave in this way and this idea is then used to extend the phase-shifting technique to colour domain.
26 citations
TL;DR: In this paper, an experimentale investigation on the effects of the number and length of periodic radial cracks on the natural frequencies of an annular plate is reported, where the inner edge of the plate is clamped, while the outer edge is kept free.
20 citations
TL;DR: The use of a commercially available Handycam is shown to meet the requirement of image capturing for digital photoelastic analysis and fringe order variations for three arbitrary lines in a circular disc under diametral compression are obtained and compared with theoretical predictions.
Abstract: An optical arrangement for application of the phaseshifting technique to reflection photoelasticity is presented. The intensity equations for application of phaseshifting methodology are obtained by Jones' calculus. A new portable reflection polariscope is designed to effect the optical arrangement. The use of a commercially available Handycam is shown to meet the requirement of image capturing for digital photoelastic analysis. Fringe order variations for three arbitrary lines in a circular disc under diametral compression are obtained by the new methodology and compared with theoretical predictions. The comparison is found to be good.
12 citations
TL;DR: The details of a PC-based, menu-driven software namely PHOTOSOFT_H to teach the principles of photoelasticity is discussed and capabilities of the package are illustrated with the aid of typical case studies.
Abstract: The twin developments of (1) the application of digital image processing (DIP) techniques for automation and (2) rapid prototyping for ease of model-making have rejuvenated the role of photoelastic...
4 citations
TL;DR: In this paper, a mode I stress intensity factor for periodic radial cracks emanating from inner and outer boundaries of an annular ring is evaluated using finite element technique and the concept of cyclic symmetry.
4 citations
TL;DR: A simple PC based device independent software for collection of photoelastic data from digitised fringe patterns is presented and validated by evaluating the near crack tip stress field parameters for a crack subjected to mode I and mode II loadings.
Abstract: The application of digital image processing (DIP) techniques to photoelasticity has greatly simplified data reduction and analysis. The softwares reported so far are hardware dependent and hence not portable. A simple PC based device independent software for collection of photoelastic data from digitised fringe patterns is presented. The software is validated by evaluating the near crack tip stress field parameters for a crack subjected to mode I and mode II loadings.
2 citations