Distant Damage-Assessment Method for Multilayer Composite Systems Using Electromagnetic Waves
Publication: Journal of Engineering Mechanics
Volume 137, Issue 8
Abstract
In this paper, a damage assessment method for remotely inspecting the near-surface condition of multilayer composite systems is proposed. The method utilizes far-field steady-state electromagnetic waves reflected from the surface of multilayer composite systems and generates the in-depth profile of the inspected composite systems using inverse synthetic aperture radar (ISAR) imaging technique. Spatial imagery of the system can be reconstructed with the structural and geometric features of the multilayer system. These features are revealed by discrete scatterers in the imagery. Reconstructed imagery can be used for detecting construction defects and structural damages in the near-surface region of the system. The theoretical background of the method is described, followed by experimental measurements on glass-fiber-reinforced polymer (GFRP)-confined concrete cylinders with an artificial defect as an example of multilayer composite systems. Continuous waves in the frequency range of 8 to 12 GHz were used. The imaging results show that the proposed method can reveal the location and size of the embedded defect in the GFRP-concrete composite system, indicating the potential use of the method as a basis for distant radar/microwave nondestructive testing/evaluation techniques in civil engineering.
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Acknowledgments
The experimental work in this paper was partially supported by the MIT Lincoln Laboratory through Grant Advanced Concept Committee (ACC)-376 with the assistance of D. Blejer at the MIT Lincoln Laboratory, whose efforts are gratefully acknowledged. The author would like to thank Dr. T. M. Grzegorczyk from Delpsi, LLC, and the late Prof. Jin Au Kong at MIT for their valuable suggestions made on this work. This work was also partially supported by the National Science Foundation (NSF) through Grant NSFCMS-0324607 during the author’s doctoral study under the supervision of Prof. O. Buyukozturk at MIT. The financial support from NSF is sincerely appreciated.
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Information
Published In
Journal of Engineering Mechanics
Volume 137 • Issue 8 • August 2011
Pages: 547 - 560
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jan 19, 2010
Accepted: Feb 23, 2011
Published online: Feb 25, 2011
Published in print: Aug 1, 2011
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