Plotting of Isochromatic and Isostatic Patterns of Slice Optically Isolated in a Three Dimensional Photoelastic Model

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We present a non destructive experimental method which gives the isochromatics and isostatics patterns of slice optically isolated in a three dimensional photoelastic model. We used a non destructive method of optical slicing developed in our laboratory. In this method, the photoelastic model is optically sliced by two plane laser beams. The analysis of the scattered light gives fringes equivalent to those obtained in a plane polariscope (isochromatic and isoclinic fringes). In order to separate the isochromatic and the isoclinic fringes, we recorded several images for different polarization orientations, separated the isoclinic and isochromatic fringes using the Fourier transform, and plotted the isostatics pattern.We show a test of a point loading on the top of a prismatic specimen and the possibilities of our method in an industrial case of a model realized by a stereolithography technique.