Application of wavelet parameters for impact damage detection in plates

Shelley, T. J. ORCID: https://orcid.org/0000-0002-4812-0285 and Liew, C. K. (2013) Application of wavelet parameters for impact damage detection in plates. Key Engineering Materials, 558. pp. 12-24. ISSN 1013-9826


Abstract

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: No
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 14 Sep 2020 23:52
Last Modified: 15 Sep 2020 00:06
Uncontrolled Keywords: composites, impact damage, structural health monitoring, ultrasonic guided waves, wavelet analysis
Fields of Research (2008): 09 Engineering > 0901 Aerospace Engineering > 090103 Aerospace Structures
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
09 Engineering > 0913 Mechanical Engineering > 091304 Dynamics, Vibration and Vibration Control
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.4028/www.scientific.net/KEM.558.12
URI: http://eprints.usq.edu.au/id/eprint/39440

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