Reconfigurable mechanism-based metamaterials for ternary-coded elastic wave polarizers and programmable refraction control  

作　　者：Zhou HU Zhibo WEI Yan CHEN Rui ZHU 

机构地区：[1]School of Aerospace Engineering,Beijing Institute of Technology,Beijing,100081,China [2]School of Mechanical Engineering,Tianjin University,Tianjin,300350,China [3]Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education,Tianjin University,Tianjin,300350,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2024年第7期1225-1242,共18页应用数学和力学（英文版）

基　　金：supported by the National Key R&D Program of China(No.2021YFE0110900);the National Natural Science Foundation of China(Nos.U22B2078 and 11991033)。

摘　　要：Elastic metamaterials with unusual elastic properties offer unprecedented ways to modulate the polarization and propagation of elastic waves.However,most of them rely on the resonant structural components,and thus are frequency-dependent and unchangeable.Here,we present a reconfigurable 2D mechanism-based metamaterial which possesses transformable and frequency-independent elastic properties.Based on the proposed mechanism-based metamaterial,interesting functionalities,such as ternarycoded elastic wave polarizer and programmable refraction,are demonstrated.Particularly,unique ternary-coded polarizers,with 1-trit polarization filtering and 2-trit polarization separating of longitudinal and transverse waves,are first achieved.Then,the strong anisotropy of the proposed metamaterial is harnessed to realize positive-negative bi-refraction,only-positive refraction,and only-negative refraction.Finally,the wave functions with detailed microstructures are numerically verified.

关 键 词：elastic metamaterial elastic wave reconfigurable design zero mode ternary code programmable refraction 

分 类 号：TB34[一般工业技术—材料科学与工程]