Mode-selective excitation and detection of ultrasonic guided waves for delamination detection in laminated aluminum plates

Amit Shelke, Tribikram Kundu, Umar Amjad, Katrin Hahn, Wolfgang Grill

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Selective modes of guided Lamb waves are generated in a laminated aluminum plate for damage detection using a broadband piezoelectric transducer structured with a rigid electrode. Appropriate excitation frequencies and modes for inspection are selected from theoretical and experimental dispersion curves. Dispersion curves are obtained experimentally by short time Fourier transform of the transient signals. Sensitivity of antisymmetric and symmetric modes for delamination detection are investigated. The antisymmetric mode is found to be more reliable for delamination detection. Unlike other studies, in which the attenuation of the propagating waves is related to the extent of the internal damage, in this investigation, the changes in the time-of-flight (TOF) of guided Lamb waves are related to the damage progression. The mode conversion phenomenon of Lamb waves during progressive delamination is investigated. Close matching between the theoretical and experimentally derived dispersion curves and TOF assures the reliability of the results presented here.

Original languageEnglish (US)
Article number5733258
Pages (from-to)567-577
Number of pages11
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume58
Issue number3
DOIs
StatePublished - Mar 1 2011

Keywords

  • Acoustics
  • Aluminum
  • Delamination
  • Dispersion
  • Electrodes
  • Piezoelectric transducers

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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