Applied Mathematics and Mechanics (English Edition) ›› 2024, Vol. 45 ›› Issue (7): 1155-1170.doi: https://doi.org/10.1007/s10483-024-3154-6

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Modeling and analysis of gradient metamaterials for broad fusion bandgaps

Changqi CAI1, Chenjie ZHU1, Fengyi ZHANG2, Jiaojiao SUN1, Kai WANG3, Bo YAN1,*(), Jiaxi ZHOU3   

  1. 1 School of Mechanical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
    2 School of Material and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
    3 College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
  • Received:2024-03-29 Online:2024-07-03 Published:2024-06-29
  • Contact: Bo YAN E-mail:yanbo@zstu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(12122206);the National Natural Science Foundation of China(52175125);the National Natural Science Foundation of China(12272129);the National Natural Science Foundation of China(12304309);the National Natural Science Foundation of China(12302039);the Zhejiang Provincial Natural Science Foundation of China(LQ24A020006);the Hong Kong Scholars Program of China(XJ2022012);the Natural Science Foundation of Hunan Province of China(2024JJ4004);Project supported by the National Natural Science Foundation of China (Nos. 12122206, 52175125, 12272129, 12304309, and 12302039), the Zhejiang Provincial Natural Science Foundation of China (No. LQ24A020006), the Hong Kong Scholars Program of China (No. XJ2022012), and the Natural Science Foundation of Hunan Province of China (No. 2024JJ4004)

Abstract:

A gradient metamaterial with varying-stiffness local resonators is proposed to open the multiple bandgaps and further form a broad fusion bandgap. First, three local resonators with linearly increasing stiffness are periodically attached to the spring-mass chain to construct the gradient metamaterial. The dispersion relation is then derived based on Bloch's theorem to reveal the fusion bandgap theoretically. The dynamic characteristic of the finite spring-mass chain is investigated to validate the fusion of multiple bandgaps. Finally, the effects of the design parameters on multiple bandgaps are discussed. The results show that the metamaterial with a non-uniform stiffness gradient pattern is capable of opening a broad fusion bandgap and effectively attenuating the longitudinal waves within a broad frequency region.

Key words: local resonance mechanism, elastic metamaterial, stiffness gradient, bandgap fusion, broadband wave attenuation

2010 MSC Number: 

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