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Structural Monitoring and Maintenance Volume 1, Number 4, December 2014, pages 411-425 DOI: http://dx.doi.org/10.12989/smm.2014.1.4.411 |
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Lamb wave-based damage imaging method for damage detection of rectangular composite plates |
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Pizhong Qiao and Wei Fan
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| Abstract | ||
| A relatively low frequency Lamb wave-based damage identification method called damage imaging method for rectangular composite plate is presented. A damage index (DI) is generated from the delay matrix of the Lamb wave response signals, and it is used to indicate the location and approximate area of the damage. The viability of this method is demonstrated by analyzing the numerical and experimental Lamb wave response signals from rectangular composite plates. The technique only requires the response signals from the plate after damage, and it is capable of performing near real time damage identification. This study sheds some light on the application of Lamb wave-based damage detection algorithm for plate-type structures by using the relatively low frequency (e.g., in the neighborhood of 100 kHz, more suitable for the best capability of the existing fiber optic sensor interrogator system with the sampling frequency of 500 kHz) Lamb wave response and a reference-free damage detection technique. | ||
| Key Words | ||
| damage detection; Lamb wave; composite plates; piezoelectric sensors and actuators; damage imaging | ||
| Address | ||
| Pizhong Qiao and Wei Fan: Department of Civil and Environmental Engineering, Washington State University, Sloan 117, Pullman, WA, 99164-2910, USA | ||