Ultrasonic attenuation in polycrystals using a self-consistent approach

Christopher M. Kube, Joseph A. Turner

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The self-consistent method of averaging elastic moduli to define the effective medium of a polycrystal is used to investigate the dynamic problem of wave propagation. An alternative covariance tensor describing the elastic moduli fluctuations of the polycrystal containing self-consistent elastic properties is derived and found to be significantly smaller than the covariance tensor formed through traditional Voigt averaging. Attenuation curves are generated using the self-consistent elastic moduli and covariance tensors and these results are compared with previous Voigt-averaged estimates. The second-order polycrystalline dispersion relation for the self-consistent scheme is found for cases of low and high crystallite anisotropy. The attenuation coefficients and dispersion relations derived through the self-consistent scheme are considerably different than previous estimates. Experimentally measured longitudinal attenuation coefficients support the use of the self-consistent scheme for estimation of attenuation.

Original languageEnglish (US)
Pages (from-to)182-193
Number of pages12
JournalWave Motion
Volume57
DOIs
StatePublished - 2015

Keywords

  • Attenuation
  • Dispersion
  • Polycrystalline media
  • Ultrasonic scattering

ASJC Scopus subject areas

  • Modeling and Simulation
  • Physics and Astronomy(all)
  • Computational Mathematics
  • Applied Mathematics

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