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Proceedings Paper

Delamination detection of composite plates using piezoceramic patches and wavelet packet analysis
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Paper Abstract

Composite materials are widely applied in aerospace, mechanical and civil structures. Delamination of composite material happens due to aging, chemical corruption and mechanical vibration, among other factors. It is important to detect the delamination in the incipient stage before the delamination reaches a notable level. Piezoelectric material can act as both actuators and sensors. In this research, two composite plates are fabricated as test specimen, of which one has a small delamination and the other is healthy. Four PZT patches are bonded at four corners of each composite plate, and one PZT patch is bonded in the middle of the composite plate. Wavelet packet analysis is applied as the signal-processing tool to analyze the sensor data. A damage index is formed based on the wavelet packet analysis to show the existence and the severity of damage. The experiment results show the proposed method can detect the delamination. This sensitive method is suited for delamination detection of inaccessible composite structures without using additional excitation facility.

Paper Details

Date Published: 20 July 2004
PDF: 11 pages
Proc. SPIE 5393, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III, (20 July 2004); doi: 10.1117/12.548828
Show Author Affiliations
Haichang Gu, Univ. of Houston (United States)
Gangbing Song, Univ. of Houston (United States)
Pizhong Qiao, Univ. of Akron (United States)

Published in SPIE Proceedings Vol. 5393:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III
Peter J. Shull; Andrew L. Gyekenyesi, Editor(s)

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