Generation and detection of higher harmonics in Rayleigh waves using laser ultrasound

Jan Herrmann, Laurence J. Jacobs, Jianmin Qu, Jin Yeon Kim

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

5 Scopus citations

Abstract

This research studies higher harmonics of Rayleigh surface waves propagating in nickel base superalloys. Rayleigh waves are used because they carry most of the energy and travel along the surface of a specimen where fatigue damage is typically initiated. The energy concentration near the free surface leads to stronger nonlinear effects compared to bulk waves. An ultrasonic piezoelectric transducer together with a plastic wedge is used for the experimental generation of the Rayleigh wave. The detection system consists of a laser heterodyne interferometer. Measurements are performed to detect the fundamental wave as well as the second harmonic. The amplitude ratio is related to the nonlinearity parameter β which is typically used to describe changes in microstructure and investigate fatigue damage.

Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Subtitle of host publicationVolume 25A
Pages262-269
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

  • Nonlinear ultrasound
  • Rayleigh waves

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