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Journal of Composite Materials
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0021998305051112v1
39/18/1645    most recent
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Article

Composites with Inclusions of Negative Bulk Modulus: Extreme Damping and Negative Poisson's Ratio

Y. C. Wang1 R S Lakes2*

1 MST-8, MS G755, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
2 Department of Engineering Physics, Engineering Mechanics Program, Biomedical Engineering Department, Materials Science Program and Rheology Research Center, University of Wisconsin-Madison, 147 Engineering Research Building, 1500 Engineering Drive, Madison, WI 53706-1609, USA

* To whom correspondence should be addressed.


  Abstract
The effect of a negative bulk modulus phase in elastic composites is studied. Negative bulk modulus K<0 is shown to be possible in selected unit cells. In isotropic solids, K<0 can be attained when negative Poisson's ratio {nu} is sufficiently small, below the stability limit (for stress control) {nu} = - 1. Such materials, if used as inclusions, are predicted to be stable with respect to the band formation, even if they are large. Composites with spherical inclusions of negative bulk moduli are shown to exhibit negative Poisson's ratio and anomalies in composite bulk modulus and Young's modulus (and in the corresponding mechanical damping) but not in the shear modulus.

Key Words: stability, viscoelasticity, negative Poisson's ratio, negative modulus

First published on June 14, 2005, doi:10.1177/0021998305051112

Journal of Composite Materials 2005;39:1645.

A more recent version of this article appeared on September 1, 2005

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