Stress Optical Coefficients For The Computer Aided Holo-Photoelastic Method

J. L. Sullivan; G. M. Brown

doi:10.1117/12.950243

31 March 1989 Stress Optical Coefficients For The Computer Aided Holo-Photoelastic Method

J. L. Sullivan, G. M. Brown

Proceedings Volume 1026, Holography Techniques and Applications; (1989) https://doi.org/10.1117/12.950243
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

The Computer Aided Holo-Photoelastic Method (CAHPM) is applied to the determination of the holographic and photoeldstic stress optical coefficients of a material. The optical fields used are the absolute and relative retardation light intensity distributions. For the former, real time holography is employed and for the latter, half fringe photoelasticity is used. The coefficients corresponding to the principal stress sum (C') and difference (C) are calculated from a least squares fit of experimental whole field stress optical data to the corresponding theoretical stress distribution ILL a L:alibration sample. The data presented were obtained from a diametrically loaded disk and the section employed for the calibration was the centerline perpendicular to the load axis. For the coefficient determinations, the method requires that a total of eleven images be collected; eight phase shifted images of absolute retardation data and three images corresponding to light and dark field circular polariscopic fields for the loaded sample and the light field for the unloaded condition. The theory for the method is reviewed and the experimental setup is also shown. Finally, the influence of retardation plate errors on the calibration results as well as for stress predictions is discussed. Once the coefficients are known, CAHPM which includes our automated isoclinic analysis can be used for exact and total stress analysis of transparent two-dimensional structures without resort to iterative techniques.

Citation Download Citation

J. L. Sullivan and G. M. Brown "Stress Optical Coefficients For The Computer Aided Holo-Photoelastic Method", Proc. SPIE 1026, Holography Techniques and Applications, (31 March 1989); https://doi.org/10.1117/12.950243

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