Nonlinear acoustic measurements and Rayleigh waves

T. O. Mueller, J. Y. Kim, J. Qu, L. J. Jacobs

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

An effective way to evaluate changes in the microstructure of a material or to assess fatigue damage at an early stage in fatigue life is by measuring the acoustic nonlinearity parameter β. Beta is defined originally for plane harmonic longitudinal waves and depends on the ratio of the amplitudes of the first and second harmonics in the measured signal. This paper extends the concept of the conventional nonlinear parameter to the case of nonlinear Rayleigh surface waves. Surface waves are more efficient in detecting fatigue damage that is usually initiated and more concentrated near the material surface. Based on using an approximate model for nonlinear wave propagation, a nonlinearity parameter β R for Rayleigh surface waves is proposed. Comparisons and discussions are made on the use of the nonlinearity parameter β R for Rayleigh surface waves.

Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Subtitle of host publicationVolume 25A
Pages291-298
Number of pages8
DOIs
StatePublished - 6 Mar 2006
EventReview of Progress in Quantitative Nondestructive - Brunswick, ME, United States
Duration: 31 Jul 20055 Aug 2005

Publication series

NameAIP Conference Proceedings
Volume820 I
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceReview of Progress in Quantitative Nondestructive
Country/TerritoryUnited States
CityBrunswick, ME
Period31/07/055/08/05

Keywords

  • Fatigue damage
  • Nonlinear Rayleigh waves
  • Nonlinear parameter

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