Application of wavelet parameters for impact damage detection in plates

Shelley, T. J. and Liew, C. K. (2013). Application of wavelet parameters for impact damage detection in plates. In: Structural Health Monitoring: Research and Applications. 4th Asia-Pacific Workshop on Structural Health Monitoring, Melbourne, Australia, (12-24). 5-7 December 2012. doi:10.4028/

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Author Shelley, T. J.
Liew, C. K.
Title of paper Application of wavelet parameters for impact damage detection in plates
Conference name 4th Asia-Pacific Workshop on Structural Health Monitoring
Conference location Melbourne, Australia
Conference dates 5-7 December 2012
Proceedings title Structural Health Monitoring: Research and Applications   Check publisher's open access policy
Journal name Key Engineering Materials   Check publisher's open access policy
Place of Publication Stafa-Zurich, Switzerland
Publisher Trans Tech Publications
Publication Year 2013
Year available 2013
Sub-type Fully published paper
DOI 10.4028/
ISBN 9783037857151
ISSN 1013-9826
Volume 558
Start page 12
End page 24
Total pages 13
Collection year 2014
Language eng
Abstract/Summary In this study, ultrasonic guided waves were used in a laser vibrometer set-up to measure impact damage responses in carbon fibre epoxy composite plates. The impact energies used resulted in internal delaminations, as well as small hairline cracks observed on the surface. By identifying a change in the baseline signal compared to the damage response signal and quantitatively characterising it, the impact damages in the specimens could be detected. Damage response could be determined from reflected peaks in the signal arriving after the initial pulse; however, the major difference found was a change in signal amplitude. In order to improve the observation of these changes, wavelet analysis was applied to the signals. Wavelet analysis provided efficient means of removing noise in the signals while allowing for useful data to be extracted from both the time and frequency domains. The maximum wavelet coefficient changes were also easily identified after normalisation to allow for the development of a quantitative index that corresponds to the damage. By relating the absorbed impact energy and the physical damage size to this index parameter, a method of characterising the damage was produced. In general, it was also found that the larger the impact energy and therefore the larger the physical damage area, the greater the calculated value of the Damage Index. This thus provides potential means of quantifying the impact damage in composites with improved efficiency compared to raw signals in the time domain.
Keyword Composites
Impact damage
Structural health monitoring
Ultrasonic guided waves
Wavelet analysis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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Created: Wed, 27 Mar 2013, 12:50:02 EST by Mr Edmund Liew on behalf of School of Mechanical and Mining Engineering