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Proceedings Paper

Diagnosis of impact damage in composite structures with built-in piezoelectrics network
Author(s): Calvin S. Wang; Fu-Kuo Chang
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Paper Abstract

An active diagnostic technique for identifying impact damage in composites is presented. A network of piezoelectric actuators and sensors were built into composites to generate and receive ultrasonic stress waves in the structures. Scattered waves were produced from the damage and were detected by sensors. A signal-processing scheme composed of smoothing filtering a joint time-frequency analysis was applied to minimize noise interference and convert sensor measurements into time-frequency spectrograms for interpretation. An identification method based on time-of- flight information obtained from the spectrograms was developed. Experiments were performed on composites with different configurations. It was demonstrated that the method was able to detect the presence of the damage and characterize the damage to a satisfactory precision. Identification results were verified with X-ray images of the structures.

Paper Details

Date Published: 21 June 2000
PDF: 7 pages
Proc. SPIE 3990, Smart Structures and Materials 2000: Smart Electronics and MEMS, (21 June 2000); doi: 10.1117/12.388893
Show Author Affiliations
Calvin S. Wang, Stanford Univ. (United States)
Fu-Kuo Chang, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 3990:
Smart Structures and Materials 2000: Smart Electronics and MEMS
Vijay K. Varadan, Editor(s)

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