Abstract
A generalized phase-shift method is developed for automatic measurement of principal-stress directions in the whole field of a model from photoelastic experiments. This method uses a set of light intensities obtained from the rotation of polaroids in dark-field plane polariscopes at each point. To investigate the accuracy of the measurement, time-series light intensity curves with different noise and different numbers of data which constitute the curves are used in computer simulation. The error of the measurement of the principal-stress directions obtained by the method is not greatly affected by noise when the number of data exceeds 50. This method is applied to a circular disk subjected to a concentrated load. The principal-stress directions obtained by the method are found to be in good agreement with the theory.
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Presented at 1996 International Workshop on Interferometry (IWI ‘96), August 27–29, Saitama, Japan.
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Umezaki, E., Kawakami, T. Measurement of Principal-Stress Directions from Photoelastic Experiment Using Generalized Phase-Shift Method. OPT REV 4, 249–252 (1997). https://doi.org/10.1007/s10043-997-0249-0
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DOI: https://doi.org/10.1007/s10043-997-0249-0