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Determination of the plastic zone by laser-speckle correlation

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Abstract

Laser-speckle-pattern correlation is used for the determination of elastic-plastic boundary on the surface of well polished metal specimens. The method employs a converging laser beam to illuminate the test object. Diffracted verging laser beam to illuminate the test object. Diffracted images are recorded and processed on a computer-based vision system. Subsequent image-correlation analysis yields information on the surface deformation of the test objects. The technique is applied to a flat tensile specimen with two circular notches at the central portion. Measured plastic zone is compared with results obtained by the finite-element method.

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Authors and Affiliations

  1. Department of Mechanical Engineering, State University of New York at Stony Brook, 11794, NY

    Y. Z. Dai (Graduate Student)

  2. Department of Mechanical and Production Engineering, National University of Singapore, 0511, Singapore

    C. J. Tay (Senior Lecturer)

  3. Mechanical Engineering, State University of New York at Stony Brook, 11794, NY

    F. P. Chiang (Director of the Laboratory for Experimental Mechanics Research and Leading Professor)

Authors
  1. Y. Z. Dai
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  2. C. J. Tay
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  3. F. P. Chiang
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Dai, Y.Z., Tay, C.J. & Chiang, F.P. Determination of the plastic zone by laser-speckle correlation. Experimental Mechanics 31, 348–352 (1991). https://doi.org/10.1007/BF02325992

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  • DOI: https://doi.org/10.1007/BF02325992

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