Application of Scattering Theory to Plastic Strain Estimation

  • Y. Z. Dai
  • F. P. Chiang


Light scattering theory and plastic deformation induced surface roughening were studied in an effort to provide some theoretical background to a nondestructive, non-contact plastic strain evaluation method. Experimental investigation shows that plastic strain on the surface of a metallic specimen is linearly proportional to surface root-mean-square roughness and inversely proportional to surface profile correlation length. Utilizing these relations along with Beckmann’s light scattering theory, we obtained an expression which describes the scattered light intensity distribution in terms of plastic strain. This expression was applied to plastic strain evaluation and favorably verified by some experiments on aluminum alloy and brass materials.


Plastic Strain Surface Profile Plastic Strain Evaluation Initial Surface Roughness Plastic Strain Level 
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. Miyagawa, A. Azushima, Measurement of plastic deformation by means of a laser beam, 9th World Conference on Nondestructive Testing. Australia (1979).Google Scholar
  2. 2.
    A. Azushima, M. Miyagawa, Measurement of plastic zone around a fatigue crack of a stainless steel structure member with a laser beam, Proceedings of the Joint Conference on Experimental Mechanics. Hawaii (1982).Google Scholar
  3. 3.
    F. P. Chiang, Y. Z. Dai, B. Q. Xu, A. Kato, Study of surface roughening under different stress modes by correlation, to appear in Proceedings of SEM Fall Conference. Baltimore (1990).Google Scholar
  4. 4.
    P. Beckmann, A. Spizzichino, “The scattering of electromagnetic waves from rough surfaces,” Pergamon Press (1963).Google Scholar
  5. 5.
    M. Fukuda, K. Yamaguchi, N. Takakura, Y. Sakano, Roughening phenomenon on free surface of products in sheet metal forming, J. Jap. Soc. Technol. Plast. 10, 994 (1974).Google Scholar
  6. 6.
    P. F. Thomson, B. V. Shafer, The roughening of free surfaces during plastic working. Int. J. Mach. Tool Des. Res. 22(4), 261(1982).CrossRefGoogle Scholar
  7. 7.
    D. L. Hold, Dislocation cell formation in metals, Journal of Applied Physics 41 (8), July (1970).Google Scholar
  8. 8.
    CJ. Chiem, J. D. Duffy, Strain rate history effects and observations of dislocation substructure in aluminum single crystals following dynamic deformation, Brown University Report MRLE-137, Rhode Island (1981).Google Scholar

Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • Y. Z. Dai
    • 1
  • F. P. Chiang
    • 1
  1. 1.Laboratory for Experimental Mechanics ResearchState University of New York at Stony BrookStony BrookUSA

Personalised recommendations