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Proceedings Paper

Visualization of yielding phenomena on carbon steel under tensile loading by speckle-pattern interferometry
Author(s): Kenji Gomi; Yuji Funamoto; Sanichiro John Yoshida; Andres Gaviria; Kensuke Ichinose; Kiyoshi Taniuchi
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Paper Abstract

A previously observed optical interferometric band pattern interpreted as representing localized strain is compared with a mechanical band structure known as the Luders' line. The interferometric band pattern is observed in fringe systems formed with the subtraction method of electronic speckle-pattern interferometry applied to in-plane displacement of plastically deforming metal specimens. The Luders' line is known to be representing localized strain. Experiments have been carried out to compare the locations of the optical band pattern and the Luders' line under the same stress condition. The experimental results indicate clear coincidence of the optical band pattern and the Luders' line, confirming the previous interpretation that the optical band pattern represents localized strain. It has been observed that the optical band pattern begins to appear at 11% lower stress than the Luders' line, indicating that strain localization occurs prior to the appearance of the first Luders' line.

Paper Details

Date Published: 27 May 2003
PDF: 6 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003);
Show Author Affiliations
Kenji Gomi, Tokyo Denki Univ. (Japan)
Yuji Funamoto, Tokyo Denki Univ. (Japan)
Sanichiro John Yoshida, Southeastern Louisiana Univ. (United States)
Andres Gaviria, Southeastern Louisiana Univ. (United States)
Kensuke Ichinose, Tokyo Denki Univ. (Japan)
Kiyoshi Taniuchi, Meiji Univ. (Japan)

Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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