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Research Papers

The Wavelike Plastic Deformation of Single Crystal Copper

[+] Author and Article Information
Russell J. McDonald, Peter Kurath

Department of Mechanical Sciences and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801

Christos Efstathiou

Department of Mechanical and Aerospace Engineering, Cornell University, 188 Rhodes Hall, Ithaca, NY 14853

J. Eng. Mater. Technol 131(3), 031013 (Jun 04, 2009) (7 pages) doi:10.1115/1.3120410 History: Received January 28, 2009; Revised March 18, 2009; Published June 04, 2009

The purpose of this work is to explore nonuniform plastic flow at small length- and time-scales. Pure single crystal copper tensile specimens were pulled along the [6¯56] crystal axis at three nominal strain-rates: 0.01%/s, 0.04%/s, and 0.10%/s. Simultaneously, the surface deformation was monitored with in situ digital image correlation over a length-scale of 100μm and a time-scale of 0.07–0.2 s. Sequential digital image correlation strain-rate fields show compelling evidence of a wavelike plastic deformation that is proportional to the nominal strain-rate and decelerates with increasing strain hardening. While a mechanism responsible for the waves is not identified, a methodology correlating observations of multiple researchers is forwarded.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Specimen geometry

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Figure 2

fcc slip planes and directions represented relative to laboratory coordinates

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Figure 3

Micrograph showing surface slip lines and DIC ex situ axial strain fields illustrating the effect of magnification. Note that the scale bar is common for all magnifications.

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Figure 4

Nominal stress versus strain for the three nominal strain-rates. Note that the 0.04%/s test had higher preloading than the 0.10%/s or 0.01%/s.

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Figure 5

Cumulative probability distribution of axial strain line scan at various optical magnifications

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Figure 6

Stress-strain deformation and the DIC axial strain-rate field summary at 0.01%/s nominal strain-rate

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Figure 7

Stress-strain deformation and the DIC axial strain-rate field summary at 0.10%/s nominal strain-rate

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Figure 8

Normalized strain-rate wave velocity versus hardening

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Figure 9

Nominal hardening behavior

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Figure 10

Typical strain-rate fields represented in the laboratory-frame (xx, yy, xy) and the rotated-frame (bb, nn, nb)

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Figure 11

Average strain components versus time for the 0.10%/s experiment resolved in the laboratory-frame (xx, yy, xy) and the rotated-frame (bb, nn, nb)

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