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TECHNICAL PAPERS

Micromechanical Analysis of Dynamic Behavior of Conventional and Negative Poisson’s Ratio Foams

[+] Author and Article Information
C. P. Chen

Department of Mechanical Engineering, Center for Laser Science and Engineering, University of Iowa, Iowa City, IA 52242

R. S. Lakes

Department of Biomedical Engineering, Center for Laser Science and Engineering, University of Iowa, Iowa City, IA 52242

J. Eng. Mater. Technol 118(3), 285-288 (Jul 01, 1996) (4 pages) doi:10.1115/1.2806807 History: Received July 16, 1995; Revised November 19, 1995; Online November 27, 2007

Abstract

Both conventional and negative Poisson ’s ratio foams exhibit dispersion of acoustic waves, as well as cut-off frequencies, at which the group velocity tends to zero. This macroscopic behavior is attributed to micro-vibration of the foam cell ribs. The purpose of this article is to develop a micromechanical model of the cut-off frequency. This model is based on the resonance of ribs which may be straight, curved, or convoluted. As foam cell ribs become more curved, the cut-off frequency decreases. Therefore foams with curved or convoluted ribs are expected to provide superior performance in applications involving the absorption of sound.

Copyright © 1996 by The American Society of Mechanical Engineers
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