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TECHNICAL PAPERS

Laser Vibrometry Based Detection of Delaminations in Glass/Epoxy Composites

[+] Author and Article Information
M. Y. Amraoui, N. A. J. Lieven

Department of Aerospace Engineering, Queens Building, University of Bristol, Bristol, BS8 1TR, UK

J. Vib. Acoust 126(3), 430-437 (Jul 30, 2004) (8 pages) doi:10.1115/1.1687390 History: Received May 01, 2002; Revised March 01, 2003; Online July 30, 2004
Copyright © 2004 by ASME
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References

Adams,  R. D., Cawley,  P., Pye,  C., and Stone,  B. J., 1978, “A Vibration Technique for Non-destructively Assessing the Integrity of Structures,” J. Mech. Eng. Sci., 20(2), pp. 93–100.
Doebling, S. W., Farrar, C. R., Prime, M. B., and Shevitz, D. W., 1996, “Damage Identification and Health Monitoring of Structural and Mechanical Systems From Changes in Their Vibration Characteristics, a Literature Review,” Los Alamos National Laboratory report LA-13070-MS.
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Chandhry,  Z., and Ganino,  A. J., 1994, “Damage Detection Using Neural Networks—An Initial Experimental Study on Debonded Beams,” J. Intell. Mater. Syst. Struct., 5, pp. 585–589.
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Marwala,  T., and Hunt,  H. E. M., 1999, “Fault Identification Using Finite Element Models and Neural Networks,” Mech. Syst. Signal Process., 13, pp. 475–490.
Castellini, P., Revel, G. M., and Scalise, L., 2001, “Diagnostic of Composite Materials by Laser Techniques: Application on Panels With Different Structures and Shapes,” Proceeding of IMAC XIX: A Conference on Structural Dynamics, Hyatt Orlando Kissimmee Florida, Vol. 1, pp. 710–716.
Dugundji,  J., 1988, “Simple Expressions for Higher Vibration Modes of uniform Euler Beams,” AIAA J., pp. 1013–1014.
An American National Standard, IEEE Standard on Piezoelectricity, ANSI/IEEE Std 176, 1987.
Wang,  B. T., and Rogers,  C. A., 1991, “Laminate Plate Theory for Specially Distributed Induced Strain Actuators,” J. Compos. Mater., 25(4), pp. 433–452.
Bishop, C. M., 1995, Neural Networks for Pattern Recognition, Oxford University Press Inc., ISBN 0-19-853864-2.

Figures

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Delaminated composite plate
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Stress distribution in plate generated by bounded piezo-actuators
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Schematic of the experimental testing
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Constant axis numbering
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Maps of the slope αii, and the deviation DVi
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Training and testing areas
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MLP neural network (classification)
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Output of the trained and tested neural networks

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