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Experimental Mechanics

, Volume 5, Issue 8, pp 241–246 | Cite as

New method for determining strain on the surface of a body with photoelastic coatings

Paper describes two methods by which photoelastic strips may be used to determine the surface stress. These methods are then compared with existing techniques, and advantages and disadvantages are discussed
  • Richard O'Regan
Article

Abstract

An experimental method has been developed for determining the strains at all points on the surface of a structure. Narrow epoxy-resin strips on a thin film are cemented to the surface of the body under study. Photoelastic studies show that the birefringent pattern of these strips is dependent only on the longitudinal strain parallel to their axes. When the strips are used in conjunction with a continuous photoelastic coating, the surface strain can be determined at all points from direct observation of the fringe patterns.

Keywords

Thin Film Mechanical Engineer Fluid Dynamics Experimental Method Direct Observation 
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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References

  1. 1.
    Drucker, D. C., “Photoelastic Separation of Principal Stresses by Oblique Incidence,”Inl. Appl. Mech., Trans. ASME,64,A161–164 (1942).Google Scholar
  2. 2.
    Drucker, D.C., “The Method of Oblique Incidence in Photoelasticity”,Proc. SESA,VIII (1) (1950).Google Scholar
  3. 3.
    Timoshenko, S., Phil. Mag.,44,1014 (1922).Google Scholar
  4. 4.
    Duffy, J., “Effects of the Thickness of Birefringent Coatings”,Experimental Mechanics,1 (3),74–82 (1961).CrossRefGoogle Scholar
  5. 5.
    Post, D., andZandman, F., “The Accuracy of the Birefringent-coating Method for Coatings of Arbitrary Thickness,,1 (1),21–23 (1961).CrossRefGoogle Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1965

Authors and Affiliations

  • Richard O'Regan
    • 1
  1. 1.Bell Telephone Laboratories, Inc.Murray Hill

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