It has been customary in the past to machine the models used in photoelastic work either of glass or celluloid and to use a compensator for measuring the difference p−q between the principal stresses p and q, point by point.
In this paper a new method is outlined, consisting of using models made of a material of a large index of forced double refraction and of making photographs or drawings of the isochromatics of the loaded model and of a comparison strip in bending. By matching the colors of the model with those of the strip in bending, a complete quantitative record of the shear stress distribution throughout the model is obtained.
An example of the application of this new procedure is given for the case of a plate with a hole subjected to tension along one axis. Since the theory of elasticity offers an accurate solution for this particular case it can be used as a means of confirmation. The paper shows a very good agreement between analysis and experiment.
© 1929 Optical Society of AmericaFull Article | PDF Article
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