Elastothermodynamic damping in particulate composites: Hollow spherical inclusions Academic Article uri icon


  • 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.

published proceedings


author list (cited authors)

  • Kinra, V. K., & Bishop, J. E.

citation count

  • 6

complete list of authors

  • Kinra, VK||Bishop, JE

publication date

  • January 1997