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Materials 2017, 10(7), 841; doi:10.3390/ma10070841

Interaction of Shear and Rayleigh–Lamb Waves with Notches and Voids in Plate Waveguides

Department of Structural and Geotechnical Engineering, Sapienza University of Rome, 00185 Rome, Italy
Current address: via Gramsci 53, 00197 Roma, Italy.
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Received: 19 May 2017 / Revised: 29 June 2017 / Accepted: 18 July 2017 / Published: 21 July 2017
(This article belongs to the Special Issue Structural Health Monitoring for Aerospace Applications 2017)
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Abstract

This paper investigates the interaction of different shear- and Rayleigh–Lamb-guided waves in plates with a discontinuity such as a notch or an internal void. The problem was solved numerically using a finite element model and by exploiting an analytical solution obtainable for the double sharp changes of the cross-section that served as a reference. We aimed to elucidate the relation between the size and shape of the discontinuity and the reflection and transmission coefficients of the scattered field. Different sizes and profiles of the discontinuity were considered, with the shapes ranging from step changes of the height to ellipses, both symmetric and nonsymmetric. Regimes related to low and high values of the product frequency multiplied by the height of the plate were investigated. These showed how the mode conversion was related to the symmetry between the incident mode and the discontinuity, and to the actual existence of multiple propagating modes. The analysis presented was motivated by the need to set up procedures that exploit propagating waves not only to detect the presence of a notch, but also to characterize its size and shape. View Full-Text
Keywords: guided waves; damage characterization; scattered fields; reflection and transmission coefficients guided waves; damage characterization; scattered fields; reflection and transmission coefficients
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Pau, A.; Achillopoulou, D.V. Interaction of Shear and Rayleigh–Lamb Waves with Notches and Voids in Plate Waveguides. Materials 2017, 10, 841.

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