A Photographic Method of Deriving Isoclinics in Photo-elastic Methods

Computer Science

Scientific paper

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Scientific paper

It is well known that the chief cause of inaccuracy in the photo-elastic method of stress analysis lies in deriving the isoclinics. We have used a photographic method which has greatly improved the accuracy with which the isoclinics can be drawn. It consists of varying the load on the model so as to blur out the isochromatic pattern (mercury green), leaving the isoclinics superimposed on a uniform grey background. The intensity of the light source is so adjusted as to enable a 30-sec. exposure of the photographic plate to be given, and the load is varied between a quarter and three-quarters of the full load used to take the isochromatic pattern. The reduction to three-quarters of full load is advisable to prevent fatigue failure. The model is carried through three complete cycles during the exposure.

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