Sandwich structures are widely used in the fields of aerospace, automobile as well as ship and offshore structures because of their excellent mechanical performances such as lightweight, high specific strength and high specific stiffness. In this study, the flexural wave band gaps and vibration isolation characteristics of sandwich plate-type elastic metamaterials are numerically and experimentally investigated. The proposed sandwich plate-type elastic metamaterials are constituted of local resonant stubs periodically deposited on a sandwich plate with periodic thin-wall aluminium tube cores. An efficient finite element method combined with a solid-shell coupling method and Bloch periodic boundary conditions is presented and validated by experimental measurements to calculate the dispersion relations and the acceleration frequency responses of sandwich plate-type elastic metamaterials. The influences of geometric parameters on the flexural wave band gaps are performed and discussed. Results show that the proposed sandwich plate-type elastic metamaterials can yield flexural wave band gaps in the low-frequency range and show significant performance on the flexural vibration isolation. Moreover, the flexural wave band gaps can be effectively modulated by the geometric parameters.

三明治结构由于其出色的机械性能，例如轻质，高比强度和高比刚度而广泛用于航空，汽车以及船舶和海上结构领域。本研究对夹层板式弹性超材料的弯曲带隙和隔振特性进行了数值和实验研究。所提出的夹心板型弹性超材料是由局部共振短管构成的，该局部共振短管周期性地沉积在具有周期性薄壁铝管芯的夹心板上。提出了一种有效的有限元方法，结合了固壳耦合方法和布洛赫周期边界条件，并通过实验测量进行了验证，以计算夹层板型弹性超材料的色散关系和加速频率响应。讨论了几何参数对弯曲带隙的影响。结果表明，所提出的夹层板型弹性超材料可以在低频范围内产生弯曲带隙，并且在弯曲振动隔离方面显示出显着的性能。而且，弯曲波带隙可以通过几何参数有效地调制。结果表明，所提出的夹层板型弹性超材料可以在低频范围内产生弯曲带隙，并且在弯曲振动隔离方面显示出显着的性能。而且，弯曲波带隙可以通过几何参数有效地调制。结果表明，所提出的夹层板型弹性超材料可以在低频范围内产生弯曲带隙，并且在弯曲振动隔离方面显示出显着的性能。而且，弯曲波带隙可以通过几何参数有效地调制。