Quantitative assessment of through-thickness crack size based on Lamb wave scattering in aluminium plates

Ye Lu, Lin Ye, Zhongqing Su, Chunhui Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

173 Citations (Scopus)


The interaction of Lamb wave modes at varying frequencies with a through-thickness crack of different lengths in aluminium plates was analysed in terms of finite element method and experimental study. For oblique-wave incidence, both numerical and experimental results showed that the wave scattering from a crack leads to complicated transmission, reflection and diffraction accompanied by possible wave-mode conversion. A dual-PZT actuation scheme was therefore applied to generate the fundamental symmetrical mode (S0) with enhanced energy to facilitate the identification of crack-scattered wave components. The relationship between crack length and the reflection/transmission coefficient obtained with the aid of the Hilbert transform was established, through which the crack length was quantitatively evaluated. The effects of wavelength of Lamb waves and wave diffraction on the properties of the reflection and transmission coefficients were analysed.
Original languageEnglish
Pages (from-to)59-68
Number of pages10
JournalNDT and E International
Issue number1
Publication statusPublished - 1 Jan 2008


  • Aluminium plate
  • Crack identification
  • Finite element method
  • Hilbert transform
  • Lamb waves

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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