Measurement of stresses by line-focus acoustic microscopy

Yung Chun Lee*, Jin O. Kim, Jan D. Achenbach

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

In this paper, line-focus acoustic microscopy has been used to determine local near-surface stresses in isotropic materials. Two surface wave modes, namely a leaky Rayleigh wave and a leaky surface-skimming longitudinal wave, have been excited by the acoustic microscope. It has been observed that the changes of the wave velocities are linearly proportional to the applied stresses, as predicted by acoustoelastic theory. The non-uniform stress field in a loaded specimen has been determined from wave velocity measurements by the use of acoustoelastic constants obtained from a calibration test. The measured stresses are in good agreement with the results calculated by a finite element method. A self-calibrating method, which determines the stress profile directly from velocity measurements without a calibration test, is proposed and the results are compared with experimental data.

Original languageEnglish (US)
Pages (from-to)359-365
Number of pages7
JournalUltrasonics
Volume32
Issue number5
DOIs
StatePublished - Sep 1994

Keywords

  • acoustic microscopy
  • acoustoelasticity
  • stress
  • surface acoustic waves

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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