A simple method for determining principal-stress directions in embedded-polariscope models |
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| Authors: | R. Mark R. B. Pipes |
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| Affiliation: | 1. Department of Civil and Geological Engineering, Princeton University, Princeton, N. J.
2. General Dynamics-Fort Worth, Fort Worth, Texas
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| Abstract: | A disadvantage of the embedded-polariscope method is the inability to observe isoclinics because the embedded Polaroid sheets are fixed within the model. Perforating the embedded active layer with an array of small-diameter holes allows observation of stress trajectories in the layer from the isochromatic patterns. Further, it is shown that the full-field fringes are little disturbed by the presence of the small perforations. The techniques of model fabrication are described, as well as an extension of the method to reveal bending-stress trajectories in plates loaded out of plane. |
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