23 March 2015 Analysis of guided wave propagation in a tapered composite panel
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Abstract
Many studies have been published in recent years on Lamb wave propagation in isotropic and (multi-layered) anisotropic structures. In this paper, adiabatic wave propagation phenomenon in a tapered composite panel made out of glass fiber reinforced polymers (GFRP) will be considered. Such structural elements are often used e.g. in wind turbine blades and aerospace structures. Here, the wave velocity of each wave mode does not only change with frequency and the direction of wave propagation. It further changes locally due to the varying cross-section of the GFRP panel.

Elastic waves were excited using a piezoelectric transducer. Full wave-field measurements using scanning Laser Doppler vibrometry have been performed. This approach allows the detailed analysis of elastic wave propagation in composite specimen with linearly changing thickness. It will be demonstrated here experimentally, that the wave velocity changes significantly due to the tapered geometry of the structure. Hence, this work motivates the theoretical and experimental analysis of adiabatic mode propagation for the purpose of Non-Destructive Testing and Structural Health Monitoring.
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Tomasz Wandowski, Pawel H. Malinowski, Jochen Moll, Maciej Radzienski, Wieslaw Ostachowicz, "Analysis of guided wave propagation in a tapered composite panel", Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 94380Q (23 March 2015); doi: 10.1117/12.2083760; https://doi.org/10.1117/12.2083760
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