Measurement of Principal-Stress Directions from Photoelastic Experiment Using Generalized Phase-Shift Method |
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Authors: | Eisaku Umezaki Tohru Kawakami |
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Affiliation: | (1) Department of Mechanical Engineering, Nippon Institute of Technology, 4-1, Gakuendai, Miyashiro, Saitama 345, Japan |
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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.Presented at 1996 International Workshop on Interferometry (IWI ‘96), August 27–29, Saitama, Japan. |
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Keywords: | experimental mechanics photoelasticity image processing phase shift method principal stress direction |
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