Internal Friction Study of a Composite with a Negative Stiffness Constituent
- 1 September 2005
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 20 (9), 2523-2533
- https://doi.org/10.1557/jmr.2005.0316
Abstract
Composites with negative stiffness constituents can exhibit material properties that exceed conventional bounds. Composites with VO2as 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
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