Detection and quantification of delamination in laminated plates from the phase of appropriate guided wave modes

Umar Amjad, Susheel Kumar Yadav, Tribikram Kundu

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Abstract

Applicability of specific Lamb wave modes for delamination detection and quantification in a laminated aluminum plate is investigated. The Lamb modes were generated in the plate using a broadband piezoelectric transducer structured with a rigid electrode. Appropriate excitation frequencies and modes for inspection were selected from theoretical dispersion curves. Sensitivity of antisymmetric and symmetric modes for delamination detection and quantification has been investigated using the Hilbert-Huang transform. The mode conversion phenomenon of Lamb waves during progressive delamination is observed. The antisymmetric mode is found to be more reliable for delamination detection and quantification. In this investigation, the changes in the phase of guided Lamb wave modes are related to the degree of delamination, unlike other studies, where mostly the attenuation of the propagating waves has been related to the extent of the internal damage, such as cracks and corrosions. Appropriate features for delamination detection and quantification are extracted from the experimental data.

Original languageEnglish (US)
Article number011006
JournalOptical Engineering
Volume55
Issue number1
DOIs
StatePublished - Jan 1 2016

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Keywords

  • dispersion
  • guided waves
  • Hilbert-Huang transform
  • phase
  • structural health monitoring
  • time of flight

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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