Leaky Lamb Waves for the Ultrasonic Nondestructive Evaluation of Adhesive Bonds

[+] Author and Article Information
Ajit K. Mal, Pei-cheng Xu

University of California, Los Angeles, Calif. 90024-1579

Yoseph Bar-Cohen

Douglas Aircraft Company, McDonnell Douglas Corporation, Long Beach, Calif. 90846

J. Eng. Mater. Technol 112(3), 255-259 (Jul 01, 1990) (5 pages) doi:10.1115/1.2903319 History: Received March 08, 1989; Online April 29, 2008


The critical role played by interface zones in the fracture and failure of composites and other bonded materials is well known. However, the existing nondestructive evaluation methods are not capable of yielding useful quantitative information on either elastic or strength related properties of the interface. The authors are investigating the feasibility of applying an ultrasonic method to determine some of the interface properties nondestructively. The method uses guided waves and is based on the fact that the dispersive properties of these waves are strongly affected by the elastic properties of the interface. A coordinated theoretical and experimental program of research has revealed that the correlation between the interfacial properties and the phase velocity of the guided waves is quite strong and is identifiable at least in laboratory specimens. Some recent results of this research are reported in this paper.

Copyright © 1990 by The American Society of Mechanical Engineers
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