Lamb Wave Basis for Impact-Echo Method Analysis
Publication: Journal of Engineering Mechanics
Volume 131, Issue 4
Abstract
The impact-echo method has been developed over the past and is now widely used in the nondestructive evaluation of concrete. However, some practical issues remain unresolved, such as the physical basis for the empirical correction factor used to obtain thickness mode frequency. A new approach based on guided wave theory is proposed in this paper: that the impact-echo resonance in plates corresponds to the zero-group-velocity frequency of the Lamb mode. A numerical model is developed, verified by experiment, and then shown to adequately simulate the dynamic response of a concrete plate. Using this model the thickness resonance mode is identified and found to accurately match that particular Lamb mode in terms of shape and frequency. New values for based on the Lamb mode model are computed and dependence on material Poisson’s ratio is demonstrated.
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Acknowledgments
Part of this work was carried out in the course of research supported by the Virginia Transportation Research Council, Project No. 68707. The writers also acknowledge Professor Richard Weaver for his assistance with the laser vibrometer equipment.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 131 • Issue 4 • April 2005
Pages: 438 - 443
Copyright
© 2005 ASCE.
History
Received: Jan 13, 2004
Accepted: Jul 24, 2004
Published online: Apr 1, 2005
Published in print: Apr 2005
Notes
Note. Associate Editor: Eric N. Landis
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