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Determination of Elastic-Plastic Boundary by Speckle Pattern Correlation

  • F. P. Chiang
  • C. J. Tay
  • Y. Z. Dai

Abstract

An optical-numerical correlation technique has been developed for detecting the elastic-plastic boundary on the surface of a material which has undergone plastic deformation. Laser speckle pattern produced from a surface is measured before and after plastic deformation which produces a change in their cross correlation. The speckle images are recorded and processed using a computer based vision system. Experimental results obtained for aluminum alloys have demonstrated the high sensitivity of this method. A comparison with theoretical and finite element results is presented.

Keywords

Cross Correlation Speckle Pattern Diffraction Image Computer Vision System Speckle Image 
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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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • F. P. Chiang
    • 1
  • C. J. Tay
    • 2
  • Y. Z. Dai
    • 3
  1. 1.Lab. for Experimental Mechanics ResearchSUNY at Stony BrookUSA
  2. 2.Dept. of Mech. Eng.SUNY at Stony BrookUSA
  3. 3.Dept. of Mech. & Indus.Nat. Univ. of SingaporeSingapore

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