A novel elastic sandwich metamaterial plate with composite periodic rod core is designed, and the frequency band-gap characteristics are numerically and experimentally investigated. The finite element and spectral element hybrid method (FE-SEHM) is developed to obtain the dynamic stiffness matrix of the sandwich metamaterial plate. The frequency response curves of the plate structure under the harmonic excitation are calculated using the presented numerical method and validated by the vibration experiment. By comparing with the frequency response curves of sandwich metamaterial plate with pure elastic rod core, improved band-gap properties are achieved from the designed metamaterial plate with composite periodic rod core. The elastic metamaterial plate with composite periodic rod core can generate more band-gaps, so it can suppress the vibration and elastic wave propagation in the structure more effectively.

设计了一种具有复合周期杆芯的新型弹性夹层超材料板，并对其频带隙特性进行了数值和实验研究。开发了有限元和谱元混合方法（FE-SEHM）来获得夹层超材料板的动态刚度矩阵。利用所提出的数值方法计算了谐波激励下板结构的频率响应曲线，并通过振动实验进行了验证。通过与纯弹性杆芯夹层超材料板的频率响应曲线进行比较，设计的复合周期杆芯超材料板提高了带隙性能。具有复合周期杆芯的弹性超材料板可以产生更多的带隙，