A simple method for determining principal-stress directions in embedded-polariscope models
Experiments show that principal-stress directions can be found from isochromatic observations of a perforated embedded layer; also, the full-field isochromatic pattern is little disturbed by the presence of small-diameter perforations
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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.
Keywords
Active Layer Circular Polarizer Drilling Operation Cellulose Acetate Butyrate Acetate Butyrate
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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© Society for Experimental Mechanics, Inc. 1970