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A neoteric interferometer for use in holographic photoelasticity

The development of a holographic interferometer that allows for the complete separation of isochromatic- and isopachic-fringe patterns is discussed

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Abstract

A shortcoming of the conventional holographic interferometer used in photoelasticity is that, for the double-exposure cases, the resulting fringe patterns are a complex combination of conventional isochromatic and isopachic fringes. This paper describes a holographic interferometer that may be used to obtain separate but simultaneous isochromatic- and isopachic-fringe patterns for photoelastic models in states of plane stress. The method requires a model with a partially reflecting front surface. Isopachics, which are proportional to the thickness change, are recorded using holographic interferometry from the transmitted light. The isochromatics are obtained from the transmitted light by conventional means. General equations relating the surface displacement of the specimen to the observed fringe patterns are developed, and examples of static and dynamic loadings are shown.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Maryland, College Park, Md.

    D. C. Holloway (Assistant Professor)

  2. Department of Mechanical Engineering, Auburn University, Auburn, Ala.

    W. F. Ranson (Assistant Professor)

  3. Theoretical and Applied Mechanics Department, University of Illinois, Urband, Ill.

    C. E. Taylor (Professor)

Authors
  1. D. C. Holloway
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  2. W. F. Ranson
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  3. C. E. Taylor
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Holloway, D.C., Ranson, W.F. & Taylor, C.E. A neoteric interferometer for use in holographic photoelasticity. Experimental Mechanics 12, 461–465 (1972). https://doi.org/10.1007/BF02328816

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  • DOI: https://doi.org/10.1007/BF02328816

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