Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16498
Title: Detection of internal delamination in multi-layer composites using wavelet packets combined with modal parameter analysis
Authors: Wei, Z
Yam, LH
Cheng, L 
Keywords: Composite
Internal delamination
Modal analysis
Wavelet packets
Issue Date: 2004
Publisher: Elsevier
Source: Composite structures, 2004, v. 64, no. 3-4, p. 377-387 How to cite?
Journal: Composite structures 
Abstract: This paper presents a study on active detection of delamination for multi-layer composites using a combination of modal analysis and wavelet transform. The analysis of modal parameters for multi-layer composites with internal delamination is carried out, and energy spectrum of wavelet packet decomposition of structural dynamic response is investigated. For several samples with different delamination dimensions and support conditions, the finite element method is used to study the relationship between delamination dimension and damage-induced change of structural physical property. Results show that delamination leads to a variation of energy dissipation in plate vibration, and it is mode-dependent. For relatively small delamination, the damage-induced changes of natural frequencies and mode shapes are too slight to be detected practically. However, by means of analysis on energy spectrum of wavelet packet decomposition even smaller delamination can be detected using the measured dynamic response signals.
URI: http://hdl.handle.net/10397/16498
ISSN: 0263-8223
EISSN: 1879-1085
DOI: 10.1016/j.compstruct.2003.09.038
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