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Proceedings Paper

Damage detection and diagnosis of composites using built-in piezoceramics
Author(s): Charles H. Keilers; Fu-Kuo Chang
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Paper Abstract

An investigation was performed to develop a technique for using built-in piezoelectrics to detect delaminations and to estimate their size and location in laminated composite structures. Both experimental and analytical work were conducted in the study. Piezoceramics were utilized as sensors for receiving signals and as actuators for dispatching diagnostic waves. A diagnostic technique was developed which combines an electromechanical structural model with an iterative damage identification algorithm to form a closed loop. The structural model was used to predict the frequency response of normal and delaminated structures excited by actuators. The identification algorithm compares the calculation with the data to find a best estimate of delamination size and location. The technique first compares the measured dynamic response to a baseline. If they disagree, the technique searches through the possible locations and sizes of delaminations using the structural model and compares the results with the measurements. The loop terminates when the calculated and the measured frequency responses agree. Tests on composite beams with implanted delaminations were conducted to verify the model and predictions. Overall, the predictions agreed with the data.

Paper Details

Date Published: 8 September 1993
PDF: 11 pages
Proc. SPIE 1917, Smart Structures and Materials 1993: Smart Structures and Intelligent Systems, (8 September 1993); doi: 10.1117/12.152833
Show Author Affiliations
Charles H. Keilers, Stanford Univ. (United States)
Fu-Kuo Chang, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 1917:
Smart Structures and Materials 1993: Smart Structures and Intelligent Systems
Nesbitt W. Hagood; Gareth J. Knowles, Editor(s)

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