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

Lu, Ye, Ye, Lin, Su, Zhongqing and Yang, Chunhui 2008, Quantitative assessment of through-thickness crack size based on Lamb wave scattering in aluminium plates, NDT & E International, vol. 41, no. 1, pp. 59-68.


Title Quantitative assessment of through-thickness crack size based on Lamb wave scattering in aluminium plates
Author(s) Lu, Ye
Ye, Lin
Su, Zhongqing
Yang, Chunhui
Journal name NDT & E International
Volume number 41
Issue number 1
Start page 59
End page 68
Publisher Elsevier Ltd
Place of publication Oxford, England
Publication date 2008-01
ISSN 0963-8695
1879-1174
Keyword(s) lamb waves
crack identification
aluminium plate
finite element method
Hilbert transform
Summary 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.
Language eng
Field of Research 090102 Aerospace Materials
Socio Economic Objective 869999 Manufacturing not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2008
Copyright notice ©2007, Elsevier Ltd
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017529

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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