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TECHNICAL BRIEFS

An Optical Interferometric Band as an Indicator of Plastic Deformation Front

[+] Author and Article Information
Sanichiro Yoshida

Department of Chemistry and Physics,  Southeastern Louisiana University, SLU 10878, Hammond, LA 70402syoshida@selu.edu

Hideyuki Ishii, Kenji Gomi, Kiyoshi Taniuchi

Department of Mechanical Engineering,  Tokyo Denki University, 2-2 Kanda Nishiki-cho, Chiyoda, Tokyo 101-8457, Japan

Kensuke Ichinose

Department of Mechanical Engineering,  Tokyo Denki University, 2-2 Kanda Nishiki-cho, Chiyoda, Tokyo 101-8457, Japanichiken@cck.dendai.ac.jp

J. Appl. Mech 72(5), 792-794 (Feb 07, 2005) (3 pages) doi:10.1115/1.1985431 History: Received October 12, 2003; Revised February 07, 2005

The Lüders’ front and a previously discovered optical interferometric band structure were observed simultaneously in steel specimens under tensile loading. The observed Lüders’ front and optical band structure show the same propagation characteristics, confirming our previous interpretation that the optical band structure represents the plastic deformation front. Analysis shows that the stress at which the optical band structure begins to appear is approximately 10% lower than the corresponding Lüders’ front, indicating that the optical band structure reveals the plastic deformation front with higher sensitivity than the Lüders’ front.

FIGURES IN THIS ARTICLE
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Copyright © 2005 by American Society of Mechanical Engineers
Topics: Deformation , Stress
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Figures

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Figure 1

Lüders’ front (upper) and WB (lower) observed simultaneously at the crosshead speed of 2.5μm∕s. Numbers represent the elapsed time in s from a reference time set before the yield point. The window inserted in the leftmost image of the upper row indicates the view of the lower images approximately.

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Figure 2

Locations of Lüders’ front and WB as a function of time. The crosshead speed is 2.5μm∕s.

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Figure 3

The stress-strain diagram in the plastic regime recorded at the same time as Fig. 1. The expanded view indicates the stress values when the Lüders’ front and WB begin to appear.

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Figure 4

Lüders’ front (upper) and WB (lower) observed simultaneously at the crosshead speed of 25μm∕s. The Lüders’ front taken at time step 184 is not shown because of poor quality.

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Figure 5

Locations of Lüders’ front and WB as a function of time. The crosshead speed is 25μm∕s.

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Figure 6

WB obtained for a common specklegram with various subtraction increments

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