Determination of the acoustoelastic coefficient for surface acoustic waves using dynamic acoustoelastography: an alternative to static strain

R. Ellwood, T. Stratoudaki, S. D. Sharples, M. Clark, M. G. Somekh

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The third-order elastic constants of a material are believed to be sensitive to residual stress, fatigue, and creep damage. The acoustoelastic coefficient is directly related to these third-order elastic constants. Several techniques have been developed to monitor the acoustoelastic coefficient using ultrasound. In this article, two techniques to impose stress on a sample are compared, one using the classical method of applying a static strain using a bending jig and the other applying a dynamic stress due to the presence of an acoustic wave. Results on aluminum samples are compared. Both techniques are found to produce similar values for the acoustoelastic coefficient. The dynamic strain technique however has the advantages that it can be applied to large, real world components, in situ, while ensuring the measurement takes place in the nondestructive, elastic regime.

Original languageEnglish
Pages (from-to)1064-1070
Number of pages7
JournalJournal of the Acoustical Society of America
Volume135
Issue number3
DOIs
Publication statusPublished - 31 Mar 2014
Externally publishedYes

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Keywords

  • acoustoelastic coefficient
  • ultrasound
  • elastic constants
  • static strain
  • dynamic stress
  • acoustic wave
  • bending jig

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