Abstract
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 language | English |
|---|---|
| Pages (from-to) | 59-68 |
| Number of pages | 10 |
| Journal | NDT and E International |
| Volume | 41 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jan 2008 |
Keywords
- Aluminium plate
- Crack identification
- Finite element method
- Hilbert transform
- Lamb waves
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering