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TECHNICAL PAPERS

Impact Strength of High Density Solid-State Microcellular Polycarbonate Foams

[+] Author and Article Information
Chris Barlow, Brian Flinn, Rajendra K. Bordia

Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195

Vipin Kumar

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

John Weller

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

J. Eng. Mater. Technol 123(2), 229-233 (Sep 19, 2000) (5 pages) doi:10.1115/1.1339004 History: Received July 07, 1999; Revised September 19, 2000
Copyright © 2001 by ASME
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References

Figures

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SEM micrographs of Izod impact fracture surfaces at various densities and cell sizes. (a) Relative density = 0.89, average cell size = 4.3 μm, (b) Relative density = 0.71, average cell size =18 μm.
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Izod impact strength as a function of relative density. Note the different samples at different times after foam to determine the effect of foaming gas on impact strength.
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Relative Izod impact strength as a function of relative foam density
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Izod impact strength as a function of average cell size. Note that all cell size samples in this plot have a relative density = 0.7. A line has been drawn through the data to aid the eye.
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Relative Izod impact strength as a function of average cell size. Note that all cell size samples in this plot have a relative density = 0.7. A line has been drawn through the data to aid the eye.
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Simplified model of pore structure used to calculate cell wall thickness
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Calculated ligament thickness as function of cell size for relative density =0.7. A line has been drawn through the data to aid the eye.
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Izod impact strength as function of calculated ligament thickness from Eq. (1.2). A line has been drawn through the data to aid the eye.

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