VISCOELASTIC BEHAVIOR OF COMPOSITE-MATERIALS WITH CONVENTIONAL-POISSON-RATIO OR NEGATIVE-POISSON-RATIO FOAM AS ONE-PHASE

This article describes experimental investigations of viscoelastic pro perties of composites consisting of conventional and re-entrant negati ve-Poisson's-ratio copper foam as a matrix, with the following high-lo ss-filler materials: viscoelastic elastomer, solder, and indium. The v iscoelastic properties of gallium and several ferrites were also deter mined. The loss tangent of the copper-elastomer composite substantiall y exceeded the (lower) Voigt limit; the loss tangent of the copper-sol der and copper-indium composites were close to the (upper) Hashin limi t for the two-solid phases and one-pore phase.