Ultra-wide band gap and wave attenuation mechanism of a novel star-shaped chiral metamaterial

作     者：Shuo WANG Anshuai WANG Yansen WU Xiaofeng LI Yongtao SUN Zhaozhan ZHANG Qian DING G.D.AYALEW Yunxiang MA Qingyu LIN Shuo WANG;Anshuai WANG;Yansen WU;Xiaofeng LI;Yongtao SUN;Zhaozhan ZHANG;Qian DING;G.D.AYALEW;Yunxiang MA;Qingyu LIN

作者机构：Department of MechanicsTianjin UniversityTianjin300350China Tianjin Key Laboratory of Nonlinear Dynamics and ControlTianjin UniversityTianjin300350China State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao066004Hebei ProvinceChina 

出 版 物：《Applied Mathematics and Mechanics(English Edition)》 (应用数学和力学（英文版）)

年 卷 期：2024年第45卷第7期

页      面：1261-1278页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Nos.12372019,12072222,12132010,12021002,and 11991032) the Open Projects of State Key Laboratory for Strength and Structural Integrity of China(No.ASSIKFJJ202303002) the State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures of China(No.SKLTESKF1901) the Aeronautical Science Foundation of China(No.ASFC-201915048001) 

主　　题：metamaterial ultra-wide band gap wave propagation vibration suppression 

摘      要：A novel hollow star-shaped chiral metamaterial(SCM)is proposed by incorporating chiral structural properties into the standard hollow star-shaped metamaterial,exhibiting a wide band gap over 1500 *** broaden the band gap,solid single-phase and two-phase SCMs are designed and simulated,which produce two ultra-wide band gaps(approximately 5116 Hz and 6027 Hz,respectively).The main reason for the formation of the ultra-wide band gap is that the rotational vibration of the concave star of two novel SCMs drains the energy of an elastic *** impacts of the concave angle of a single-phase SCM and the resonator radius of a two-phase SCM on the band gaps are *** the concave angle leads to an increase in the width of the widest band gap,and the width of the widest band gap increases as the resonator radius of the two-phase SCM ***,the study on elastic wave propagation characteristics involves analyzing frequency dispersion surfaces,wave propagation directions,group velocities,and phase ***,the analysis focuses on the transmission properties of finite periodic *** solid single-phase SCM achieves a maximum vibration attenuation over 800,while the width of the band gap is smaller than that of the two-phase *** metamaterials exhibit high vibration attenuation capabilities,which can be used in wideband vibration reduction to satisfy the requirement of ultra-wide frequencies.