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TECHNICAL PAPERS

A Stress and Relative Density-Dependent Dynamic Compliance Spectra Model of the Creep Response of Microcellular Polycarbonate

[+] Author and Article Information
W. D. Armstrong

Thomas J. Watson School of Engineering and Applied Science, Department of Mechanical Engineering, State University of New York, Binghamton, NY 13902-6000

V. Kumar

Department of Mechanical Engineering, University of Washington, Seattle, WA 98195

J. Appl. Mech 67(4), 663-666 (Jul 05, 2000) (4 pages) doi:10.1115/1.1329127 History: Received August 25, 1998; Revised July 05, 2000
Copyright © 2000 by ASME
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References

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Kumar,  V., , 1994, “Characterization of Tensile Behavior of Microcellular Polycarbonate,” ASME J. Eng. Mater. Technol., 116, pp. 439–445.
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Barlow, C., 1997, Masters thesis, “The Effects of Microstructure on the Fracture Behavior of Microcellular Polycarbonate,” Department of Materials Science and Engineering, University of Washington, Seattle.
Wing, G., 1993, Masters thesis, “Time Dependent Behavior of Microcellular Polycarbonate,” Department of Materials Science and Engineering, University of Washington, Seattle.
Wing,  G., , 1995, “Time Dependent Response of Polycarbonate and Microcellular Polycarbonate,” Polym. Eng. Sci., 35, No. 8, pp. 673–679.
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Armstrong,  W. D., 1998, “A Stress Dependent Dynamic Compliance Spectra Approach to the Nonlinear Viscoelastic Response of Polymers,” J. Polym. Sci., Part B: Polym. Phys., 36, pp. 2301–2309.
Armstrong,  W. D., and Kumar,  V., 2000, “A Discrete Complex Compliance Spectra Model of the Nonlinear Viscoelastic Creep and Recovery of Microcellular Polymers,” J. Polym. Sci., Part B: Polym. Phys., 38, pp. 691–697.

Figures

Grahic Jump Location
The stress-relative density dependencies of the real, (a), and imaginary, (b), parts of the third discrete dynamic compliance component. Dots indicate experimental measurements.
Grahic Jump Location
Comparison between experimental creep measurements and model calculations; (a) relative density=0.81, s=27.6, 24.1, and 13.8 Mpa, (b) relative density=0.95, s=34.5, 31.0, and 20.7 Mpa, and (c) relative density=1.00, s=51.7, 48.2, and 41.3 Mpa.
Grahic Jump Location
Predicted creep strain as a function of applied stress and relative density; (a) creep strain after 31 minutes with one percent creep contours ranging evenly from 3 percent strain to 9 percent strain, and (b) creep strain after 501 minutes with one percent creep contours ranging evenly from six percent strain to 12 percent strain.

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