Finite-Element Analysis of Lamb Wave Propagation in a Thin Aluminum Plate
Publication: Journal of Aerospace Engineering
Volume 22, Issue 2
Abstract
Structural health monitoring (SHM) is an emerging technology that can be used to identify, locate, and quantify structural damages before failure. Among SHM techniques, Lamb waves are widely used since they can cover large areas from a single location. The development of various structural simulation programs has lead to increasing interest in whether SHM data obtained from the simulation can be verified by experimentation. The objective of this research is to determine the Lamb wave responses of SHM models using the finite-element software package ABAQUS CAE as a computational tool for an isotropic plate. These results are compared to experimental results and theoretical predictions under isothermal and thermal gradient conditions to assess the sensitivity of piezoelectric generated Lamb wave propagation. Simulations of isothermal tests are conducted over a temperature range of using 100 and as excitation frequencies. The changes in temperature-dependent material properties are used to measure the differences in the response signal’s waveform and propagation speed. An analysis of the simulated signal response data demonstrated that elevated temperatures delay the Lamb wave propagation, although the delays are found to be minimal at the temperatures tested.
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Acknowledgments
The writers would like to acknowledge M. Derriso AFRL-VA for his financial support and S. Olsen and M. DeSimio for their technical assistance. The views expressed in this work are those of the writers and do not reflect the official policy or position of the U.S. Air Force, the Department of Defense, or the United States Government. This material is declared a work of the United States Government and is not subject to copyright protection in the United States.
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 22 • Issue 2 • April 2009
Pages: 185 - 197
Copyright
© 2009 ASCE.
History
Received: Sep 21, 2007
Accepted: Oct 22, 2007
Published online: Apr 1, 2009
Published in print: Apr 2009
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