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TECHNICAL PAPERS

Elastothermodynamic Damping in Particulate Composites: Hollow Spherical Inclusions

[+] Author and Article Information
V. K. Kinra, J. E. Bishop

Center for Mechanics of Composites, Department of Aerospace Engineering, Texas A&M University, College Station, TX 77843-3141

J. Appl. Mech 64(1), 111-115 (Mar 01, 1997) (5 pages) doi:10.1115/1.2787260 History: Received August 31, 1995; Revised June 10, 1996; Online October 25, 2007

Abstract

When a composite material is subjected to a time-harmonic stress field (homogeneous or inhomogeneous), different phases undergo different temperature fluctuations due to the well-known thermoelastic effect. As a result irreversible heat conduction occurs within each phase and between phases, and entropy is produced. This entropy production is the genesis of elastothermodynamic damping and, as a consequence of the second law of thermodynamics, manifests itself as a conversion of work into heat. This paper is concerned with the calculation of elastothermodynamic damping in a matrix reinforced with hollow spheres. Numerical results are presented for an alumina/aluminum composite sphere subjected to a uniform radial stress at the outer boundary. When the cavity occupies more than 75 percent volume fraction of the alumina inclusion, the total damping becomes vanishingly small.

Copyright © 1997 by The American Society of Mechanical Engineers
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