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Band gaps of elastic waves in 1-D phononic crystal with dipolar gradient elasticity

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Abstract

The dispersive relations of Bloch waves in the periodic laminated structure formed by periodically repeating of two different gradient elastic solids are studied in this paper. First, the various wave modes in the gradient elastic solid, which are different from those in the classical elastic solid, are formulated. Apart from the dispersive P wave and SV wave, there are two evanescent waves, which become the P type and S type surface waves at the interface of two different gradient elastic solids. Next, the continuity conditions of displacement vector, the normal derivative of the displacement vector and the monopolar and dipolar tractions across the interface between two different gradient elastic solids are used to derive the transfer matrix of the state vector in a typical single cell. At last, the Bloch theorem of Bloch waves in the periodical structure is used to give the dispersive equation. The in-plane Bloch waves and the anti-plane Bloch waves are both considered in the present work. The oblique propagation situation and the normal propagation situation are also considered, respectively. The numerical results are obtained by solving the dispersive equation. The influences of two microstructure parameters of the gradient elastic solid and the microstructure parameter ratio of two different gradient elastic solids on the dispersive relation are discussed based on the numerical results.

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Authors and Affiliations

  1. Department of Applied Mechanics, University of Sciences and Technology Beijing, Beijing, 100083, China

    Yueqiu Li, Peijun Wei & Yahong Zhou

  2. State Key Laboratory of Nonlinear Mechanics (LNM), Chinese Academy of Science, Beijing, China

    Peijun Wei

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  1. Yueqiu Li
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  2. Peijun Wei
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  3. Yahong Zhou
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Correspondence to Peijun Wei.

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Li, Y., Wei, P. & Zhou, Y. Band gaps of elastic waves in 1-D phononic crystal with dipolar gradient elasticity. Acta Mech 227, 1005–1023 (2016). https://doi.org/10.1007/s00707-015-1495-z

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  • DOI: https://doi.org/10.1007/s00707-015-1495-z

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