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Internal Friction Study of a Composite with a Negative Stiffness Constituent

Published online by Cambridge University Press:  03 March 2011

T. Jaglinski ,
D. Stone  and
R.S. Lakes
T. Jaglinski
Affiliation:
Materials Science Program, University of Wisconsin—Madison, Madison, Wisconsin 53706-1687
D. Stone*
Affiliation:
Materials Science Program and Department of Materials Science, University of Wisconsin—Madison, Madison, Wisconsin 53706-1687
R.S. Lakes*
Affiliation:
Department of Engineering Physics, Engineering Mechanics Program, Biomedical Engineering Department, Materials Science Program, and Rheology Research Center, University of Wisconsin—Madison, Madison, Wisconsin 53706-1687
*
a) Address all correspondence to this author. e-mail: dstone@engr.wisc.edu
b) Address all correspondence to this author. e-mail: lakes@engr.wisc.edu
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Abstract

Composites with negative stiffness constituents can exhibit material properties that exceed conventional bounds. Composites with VO2 as negative stiffness inclusions and tin as the stabilizing matrix were prepared via powder metallurgy. Specimens were tested over a range of temperature in torsion using broadband viscoelastic spectroscopy. Composites processed via powder metallurgy exhibited internal friction anomalies over a broad range of temperatures, in contrast to the single, sharp anomalies reported previously from cast specimens. The detailed material behavior encompassed a variety of responses, which were also dependent on the number of thermal cycles. Composite theory predictions assuming a distribution of negative shear moduli can account for peak broadening.

Keywords

CompositeInternal frictionPowder

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Type
Articles
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Journal of Materials Research , Volume 20 , Issue 9 , September 2005 , pp. 2523 - 2533
Copyright
Copyright © Materials Research Society 2005

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References

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