Measuring acoustic nonlinearity by collinear mixing waves

M. Liu, G. Tang, L. J. Jacobs, J. Qu

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

15 Scopus citations

Abstract

It is well known that the acoustic nonlinearity parameter β is correlated to fatigue damage in metallic materials. Various methods have been developed to measure β. One of the most often used methods is the harmonic generation technique, in which β is obtained by measuring the magnitude of the second order harmonic waves. An inherent weakness of this method is the difficulty in distinguishing material nonlinearity from the nonlinearity of the measurement system. In this paper, we demonstrate the possibility of using collinear mixing waves to measure β. The wave mixing method is based on the interaction between two incident waves in a nonlinear medium. Under certain conditions, such interactions generate a third wave of different frequency. This generated third wave is also called resonant wave, because its amplitude is unbounded if the medium has no attenuation. Such resonant waves are less sensitive to the nonlinearity of the measurement system, and have the potential to identify the source location of the nonlinearity. In this work, we used a longitudinal wave and a shear wave as the incident waves. The resonant shear wave is measured experimentally on samples made of aluminum and steel, respectively. Numerical simulations of the tests were also performed using a finite difference method.

Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Pages322-329
Number of pages8
DOIs
StatePublished - 2011
Event37th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE - San Diego, CA, United States
Duration: 18 Jul 201023 Jul 2010

Publication series

NameAIP Conference Proceedings
Volume1335
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference37th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE
Country/TerritoryUnited States
CitySan Diego, CA
Period18/07/1023/07/10

Keywords

  • Mixing Waves
  • NDE
  • Nonlinear Ultrasound

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