TY - JOUR
T1 - Quantitative assessment of through-thickness crack size based on Lamb wave scattering in aluminium plates
AU - Lu, Ye
AU - Ye, Lin
AU - Su, Zhongqing
AU - Yang, Chunhui
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
UR - http://handle.uws.edu.au:8081/1959.7/557071
U2 - 10.1016/j.ndteint.2007.07.003
DO - 10.1016/j.ndteint.2007.07.003
M3 - Article
SN - 0963-8695
VL - 41
SP - 59
EP - 68
JO - NDT and E International
JF - NDT and E International
IS - 1
ER -