23 March 2015 Wavenumber study of guided waves in aluminum honeycomb sandwich structures
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In this paper, the fundamentals of guided waves in honeycomb sandwich structures are investigated through wavefield and wavenumber analyses. The guided wavefields are obtained through finite element modeling (FEM) as well as laser vibrometry experiments. The FEM and laser vibrometry results agree well with each other. At low frequencies, the guided wavefields show global guided waves which propagate in the entire sandwich with elliptical wave fronts. With the increase of wave frequency, the global guided waves gradually disappear. At high frequencies, guided waves propagate in the single skin plate instead of the entire sandwich, and strong wave interactions with the honeycomb core are observed. To further investigate the wave propagation fundamentals in the honeycomb sandwich, the guided wavefields are transformed to the wavenumber spectra by using three-dimensional Fourier transform. In the wavenumber domain, the wavenumber spectra unveil the wavenumber information of the wavefields. At the low frequencies, the wavenumber spectra of honeycomb sandwich are elliptical ring-shaped. With the increase of frequency, the elliptical ring-shaped wavenumber band is gradually asymptotic to a circular ring. Moreover, with the increase of frequency, the wavenumber values of the honeycomb sandwich are gradually getting closer to the wavenumbers of A0 mode in a single skin plate.
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Zhenhua Tian, Zhenhua Tian, Lingyu Yu, Lingyu Yu, Guoliang Huang, Guoliang Huang, Michel van Tooren, Michel van Tooren, Will Mitchell, Will Mitchell, "Wavenumber study of guided waves in aluminum honeycomb sandwich structures", Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 943807 (23 March 2015); doi: 10.1117/12.2083742; https://doi.org/10.1117/12.2083742

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