Determination of Elastic-Plastic Boundary by Speckle Pattern Correlation

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


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.


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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    K. Yamaguchi, RB. Mellor, “Thickness and grain size dependence of limit strains in sheet metal stretching,” Int. J. Mech. Sci. 18, 85–90 (1976).CrossRefGoogle Scholar
  2. 2.
    P. F. Thomson, B. V. Shafer, “The roughening of free surface during plastic working,” Int. J. of Mach. Tool Des. Res. 22(4), 261–264 (1982).CrossRefGoogle Scholar
  3. 3.
    J. H. Dautzenberg and J. A. G. Kals, “Stress state and surface roughness,” in: Advances Technology of Plasticity. Japan (1984).Google Scholar
  4. 4.
    M. Miyagawa and A. Azushima, “Measurement of plastic deformation by means of a laser beam,” in: Proceedings of the 9th World Conference on Nondestructive Testing, Session 4a-4, pp. 1-7, Melbourne, Australia (November 1979).Google Scholar
  5. 5.
    D. Sigler and W. L. Haworth, “Strain measurement by optical correlation,” J. of Nondestructive Evaluation 2(2), 125–132 (1981).CrossRefGoogle Scholar
  6. 6.
    C. Lee, Y. J. Chao, W. H. Peters and M. A. Sutton, “Surface texture and plastic deformation,” in: Proceedings of the 13th Southeastern Conference on Theoretical and Applied Mechanics, pp. 275-283, Columbia, South Carolina (1986).Google Scholar
  7. 7.
    C. Lee, YJ. Chao, M. A. Sutton, et al., “Determination of plastic strain at notches by image-processing methods,” Experimental Mechanics 29(2), 214–220 (1989).CrossRefGoogle Scholar
  8. 8.
    A. Rosenfeld and C. A. Kak, Digital Picture Processing. Academic Press, pp. 19 (1982).Google Scholar
  9. 9.
    M. Francon, Laser Speckle and Related Applications in Optics. Academic Press, pp. 21-24 (1979).Google Scholar
  10. 10.
    D. J. P. Hartog, Advanced Strength of Materials. McGraw Hill Book Co. (1952).Google Scholar

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

Personalised recommendations