Effective wave velocity and attenuation in a material with distributed penny-shaped cracks

Zhang Ch.*, J. D. Achenbach

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Wave propagation in a material containing distributed penny-shaped cracks was investigated. An improved approach was developed for calculating the phase velocity and the attenuation of ultrasonic waves. In this approach, the effects of neighboring cracks on a reference crack are approximated by the effects of triads of double forces of strengths proportional to the crack opening volumes, and located at the geometrical centers of the cracks. The averaged crack opening displacements and crack opening volumes of the reference crack are split into two terms. The first term corresponds to the quantities induced by the interaction of the single reference crack with an incident wave, while the second term represents the interaction between this reference crack and neighboring cracks. The averaged crack opening displacements are used in calculating the forward scattering amplitude, from which the phase velocity and the coefficient of attenuation are subsequently computed. The present analysis was limited to parallel cracks and to low frequencies, but the principle can be used for more general cases. Since crack interactions have been taken into account, the analysis provides a better approximation than the standard approach proposed by Foldy (1945, Phys. Rev. 67, 107-119), especially for intermediate and large crack densities.

Original languageEnglish (US)
Pages (from-to)751-767
Number of pages17
JournalInternational Journal of Solids and Structures
Volume27
Issue number6
DOIs
StatePublished - 1991

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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