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Concepts of the photoelastic stress gage

Birefringence developed in light transversing a path parallel to the workpiece surface is utilized in photoelastic stress gage

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Abstract

With the photoelastic stress gage birefringence readings are made with light that traverses a path parallel to the surface of the workpiece. Individual stresses are determined in the elastic range of deformation, rather than stress or strain differences. The theory of a circular and linear stress gage is developed, including the influence of Poisson's ratio, and stress gradients. Stresses in the surface of the workpiece are expressed in terms of measured birefringence.

Instrumentation is extremely simple. High sensitivity is derived from the relatively long optical-path length through the transducer. Applications should include stress analysis, load analysis and transducer design.

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References

  1. Zandman, F., “Analyse des Contraintes par Vernis Photoelastiques” (Stress Analysis with Photoelastic Coatings trans.), G. A. M. A. C., 15 Rue Vauquelin, Paris, France, 1955 (French S. E. S. A.).

  2. D'Agostino, J., Drucker, D. C., Liu, C. K., andMylonas, C., “An Analysis of Plastic Behavior of Metals with Bonded Birefringent Plastic,”Proceedings of the Society for Experimental Stress Analysis, Vol. XII, 2 1955, pp. 115–122.

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  3. Post, D., andZandman, F., “Accuracy of Birefringent-coating Method for Coatings of Arbitrary Thickness,”Experimental Mechanics,1 No. 1,21–32 (January 1961).

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  4. Golubovic, G., “Procede de determination des contraintes mecaniques et dispositif pour le mise en ouevre de ce procede” (contains description of the photoelastic gages), Pat. No. 1.163.306 delivered on Dec. 14, 1956.

  5. Zandman, F., “New PhotoStress Gage,” The Interpreter Vol. 1, No. 2.June 1959, published by Tatnall Measuring Systems Co., Phoenixville, Pa.

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  6. Oppel, G., “Photoelastic Strain Gages,”Experimental Mechanics,1,No. 3,65–73 (March 1961).

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Authors
  1. Felix Zandman
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Additional information

Felix Zandman is President, Vishay Instruments, Inc.; was formerly associated with Instruments Division of the Budd Co., Phoenixville, Pa.

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Zandman, F. Concepts of the photoelastic stress gage. Experimental Mechanics 2, 225–233 (1962). https://doi.org/10.1007/BF02326720

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  • DOI: https://doi.org/10.1007/BF02326720

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