Internal Friction Study of a Composite with a Negative Stiffness Constituent

T. Jaglinski, D. Stone, R.S. Lakes
2005 Journal of Materials Research  
Composites with negative stiffness constituents can exhibit material properties that exceed conventional bounds. Composites with VO 2 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
more » ... s 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.
doi:10.1557/jmr.2005.0316 fatcat:uohwytwgqnas7iuqh2x6mbhc5y