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Proceedings Paper

Multiple component mode conversion coefficients via Lamb wave polarization measurements
Author(s): James T. Ayers; Nicoleta Apetre; Massimo Ruzzene
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Paper Abstract

The paper presents a method of quantifying the mode conversion of Lamb waves within a 1D structure from a notch-like asymmetric damage using both in-plane and out-of-plane velocity/displacement measurements. The method is applied to data recorded from a Scanning Laser Doppler Vibrometer, and likewise to numerical studies from a plane strain finite element model. A filtering procedure is implemented, and the reflected, converted, and transmitted waves are separated in the frequency/wavenumber domain, and then integrated spatially in the space/frequency domain. An accurate experimental technique for capturing the multiple components from a single laser head is verified. Based on an initial in-plane excitation, the spatially-integrated multiple component mode conversion coefficients are shown to mitigate experimental noise compared to single component mode conversion coefficients.

Paper Details

Date Published: 31 March 2011
PDF: 17 pages
Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 798411 (31 March 2011);
Show Author Affiliations
James T. Ayers, U.S. Army Research Lab. (United States)
Nicoleta Apetre, Georgia Institute of Technology (United States)
Massimo Ruzzene, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7984:
Health Monitoring of Structural and Biological Systems 2011
Tribikram Kundu, Editor(s)

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