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Theoretical and numerical investigation of HF elastic wave propagation in two-dimensional periodic beam lattices

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Abstract

The elastic wave propagation phenomena in two-dimensional periodic beam lattices are studied by using the Bloch wave transform. The numerical modeling is applied to the hexagonal and the rectangular beam lattices, in which, both the in-plane (with respect to the lattice plane) and out-of-plane waves are considered. The dispersion relations are obtained by calculating the Bloch eigenfrequencies and eigenmodes. The frequency bandgaps are observed and the influence of the elastic and geometric properties of the primitive cell on the bandgaps is studied. By analyzing the phase and the group velocities of the Bloch wave modes, the anisotropic behaviors and the dispersive characteristics of the hexagonal beam lattice with respect to the wave propagation are highlighted in high frequency domains. One important result presented herein is the comparison between the first Bloch wave modes to the membrane and bending/transverse shear wave modes of the classical equivalent homogenized orthotropic plate model of the hexagonal beam lattice. It is shown that, in low frequency ranges, the homogenized plate model can correctly represent both the in-plane and out-of-plane dynamic behaviors of the beam lattice, its frequency validity domain can be precisely evaluated thanks to the Bloch modal analysis. As another important and original result, we have highlighted the existence of the retropropagating Bloch wave modes with a negative group velocity, and of the corresponding “retro-propagating” frequency bands.

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Authors and Affiliations

  1. Laboratory MSSMat (UMR-CNRS 8579), Ecole Centrale Paris, Grande Voie des Vignes, 92295, Châtenay-Malabry Cedex, France

    B. Tie, B. Y. Tian & D. Aubry

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  1. B. Tie
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  2. B. Y. Tian
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  3. D. Aubry
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Correspondence to B. Tie.

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Tie, B., Tian, B.Y. & Aubry, D. Theoretical and numerical investigation of HF elastic wave propagation in two-dimensional periodic beam lattices. Acta Mech Sin 29, 783–798 (2013). https://doi.org/10.1007/s10409-013-0087-1

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  • DOI: https://doi.org/10.1007/s10409-013-0087-1

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