31 March 2011 Multiple component mode conversion coefficients via Lamb wave polarization measurements
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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.
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James T. Ayers, James T. Ayers, Nicoleta Apetre, Nicoleta Apetre, Massimo Ruzzene, Massimo Ruzzene, "Multiple component mode conversion coefficients via Lamb wave polarization measurements", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 798411 (31 March 2011); doi: 10.1117/12.880065; https://doi.org/10.1117/12.880065
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