Asymmetric viscoelastic metamaterials for broad bandgap design and unidirectional zero reflection

Yi, Jianlin; Li, Zheng; Negahban, Mehrdad; Xia, Rongyu; Zhu, Jueyong

doi:10.1016/j.ymssp.2021.108101

Cited by 17 publications

(7 citation statements)

References 45 publications

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“…This advancement will support the engineering application of intelligent wave devices and contribute to the practical realization of topological energy transport. 10)Viscoelasticity represents an inherent loss property in passive materials, and a method has been developed to manipulate and achieve EPs in such passive viscoelasticity materials. [ 301–303 ] This approach for obtaining EPs in passive materials is deemed more versatile compared to PT‐symmetric systems. However, the practical realization of this method in experimental settings warrants further investigation.…”

Section: Discussionmentioning

confidence: 99%

Wave Manipulation in Intelligent Metamaterials: Recent Progress and Prospects

Wu,

Jiang,

Jiang

et al. 2024

Adv Funct Materials

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Metamaterials (MMs), which include phononic crystals (PCs) as a particular type, exhibit anomalous wave propagation properties through artificial design of topologies or lattice forms of unit‐cells. Recent advancements in MMs signify an ascendant research trend, providing promising design ideas and means for unprecedented wave propagation properties. The imperative for on‐demand, real‐time active control of wave propagation underscores the significance of tunable manipulation of acoustic/elastic waves, promoting the design and development of tunable MMs. Furthermore, the versatility of intelligent materials and their ongoing development and innovation contribute significantly to the emergence of diverse intelligent MMs. This comprehensive survey provides an overview of recent advancements and current research trends in the interdisciplinary field of intelligent MMs with electro‐/magneto‐mechanical couplings. The primary objective of the review is to emphasize significant progress in agile manipulation of acoustic/elastic waves in electro‐/magneto‐mechanical coupled MMs, followed by an in‐depth exploration of intelligent metasurfaces, topological MMs, non‐Hermitian parity‐time symmetric wave systems, odd elastic MMs, and spatiotemporally modulated MMs. Special emphasis is given to multi‐field coupling effects. The review concludes with a summary and outlines potential prospects, offering a timely and informative guide for future studies on actively tunable PCs and MMs in practical engineering applications.

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Section: Discussionmentioning

confidence: 99%

Wave Manipulation in Intelligent Metamaterials: Recent Progress and Prospects

Wu,

Jiang,

Jiang

et al. 2024

Adv Funct Materials

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“…They found that by adjusting the mass of the two oscillators in the cell, a quasi-bandgap is created, which results in a wider isolation bandwidth. 17 . Lewińska et al studied a locally resonant acoustic metamaterial consisting of tungsten, epoxy and rubber and found that the viscoelastic material affects both the band gap location and also the attenuation of waves at frequencies around the band gap 18 .…”

Section: Introductionmentioning

confidence: 99%

Evanescent Lamb waves in viscoelastic phononic metastrip

Guo

Zhang

Wang

et al. 2022

International Journal of Mechanical Sciences

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“…However, the PT symmetric condition for balanced gain and loss is too hard to be satisfied in elastic metamaterials since the effective and stable gain is difficult to be provided. Therefore, the passive asymmetric metamaterials only involving the viscosity loss of materials were designed to achieve the UZR associated with the EP [20,21], but the frequency of the EP or UZR is determined and unchangeable.…”

Section: Introductionmentioning

confidence: 99%

Versatile non-Hermitian piezoelectric metamaterial beam with tunable asymmetric reflections

Xia

et al. 2022

Front. Phys.

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Non-Hermitian systems have been widely utilized to achieve specific functions for manipulating abnormal wave motion, such as asymmetric mode switching, unidirectional zero reflection (UZR), and unidirectional perfect absorption (UPA). In this paper, a novel non-Hermitian piezoelectric metamaterial beam is proposed to realize the tunable UZR of flexural waves. The unit cell of this non-Hermitian metamaterial beam consists of a host beam and two pairs of piezoelectric patches shunting different resistor–inductor circuits. Based on the flexural wave theory, the transfer matrix method is introduced to analyze the influence of electrical boundary conditions on the UZR and further clarify the relationship between the UZR and the exceptional point. The exceptional point depends only on the dissipative circuit, and it has no need for the balanced gain and loss like parity–time symmetric metamaterial. Furthermore, the UZR for the desired frequency is realized by applying a genetic algorithm, and its effectivity is experimentally validated. In addition, the non-Hermitian metamaterial beam is designed to realize the UPA of flexural waves. Results indicate that the proposed metamaterial beam is versatile and can achieve tunable manipulations of asymmetric wave propagations and has widely promising applications in many fields, such as non-destructive testing, enhanced sensing, wave isolation and vibration attenuation.

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Asymmetric viscoelastic metamaterials for broad bandgap design and unidirectional zero reflection

Cited by 17 publications

References 45 publications

Wave Manipulation in Intelligent Metamaterials: Recent Progress and Prospects

Wave Manipulation in Intelligent Metamaterials: Recent Progress and Prospects

Evanescent Lamb waves in viscoelastic phononic metastrip

Versatile non-Hermitian piezoelectric metamaterial beam with tunable asymmetric reflections

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