A nonlinear damped metamaterial: Wideband attenuation with nonlinear bandgap and modal dissipation

Zhao, Bao; Thomsen, Henrik R.; Pu, Xingbo; Fang, Shitong; Lai, Zhihui; Damme, Bart Van; Bergamini, Andrea; Chatzi, Eleni; Colombi, Andrea

doi:10.1016/j.ymssp.2023.111079

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…An emerging perspective to enhance the performances of locally resonant metamaterials is to use nonlinearities, e.g. for wideband attenuation [151][152][153]. To this aim, the study in Shen & Lacarbonara [152] proposed lattice metamaterials with membrane-shaped resonators supporting central masses, while Zhao et al [153] envisaged beams equipped with periodically distributed inertia amplifiers, whose geometric nonlinearity induces amplitude-dependent nonlinear damping effects.…”

Section: Engineering Applicationsmentioning

confidence: 99%

Current developments in elastic and acoustic metamaterials science

Failla,

Marzani,

Palermo

et al. 2024

Phil. Trans. R. Soc. A.

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The concept of metamaterial recently emerged as a new frontier of scientific research, encompassing physics, materials science and engineering. In a broad sense, a metamaterial indicates an engineered material with exotic properties not found in nature, obtained by appropriate architecture either at macro-scale or at micro-/nano-scales. The architecture of metamaterials can be tailored to open unforeseen opportunities for mechanical and acoustic applications, as demonstrated by an impressive and increasing number of studies. Building on this knowledge, this theme issue aims to gather cutting-edge theoretical, computational and experimental studies on elastic and acoustic metamaterials, with the purpose of offering a wide perspective on recent achievements and future challenges. This article is part of the theme issue ‘Current developments in elastic and acoustic metamaterials science (Part 1)’.

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Section: Engineering Applicationsmentioning

confidence: 99%

Current developments in elastic and acoustic metamaterials science

Failla,

Marzani,

Palermo

et al. 2024

Phil. Trans. R. Soc. A.

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“…Metamaterials-with their engineered structures-have been heavily exploited in the past couple of decades both for static and dynamic applications. They have been proven useful for a variety of applications such as sound absorption [1], elastic wave guiding [2], energy harvesting [3,4], mechanical neural smart devices [5] and seismic and vibration shielding [6][7][8], to name a few. One of the most important features of such structures is the so-called bandgap [9], defined as the frequency range where the propagation of waves is prohibited [9].…”

Section: Introductionmentioning

confidence: 99%

Elastic wave control in reticulated plates using Schwarz primitive cells

Hejazi Nooghabi,

Thomsen,

Zhao

et al. 2024

Phil. Trans. R. Soc. A.

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In this work, the Schwarz primitive unit cell is used as the building block of different types of metastructures for steering and focusing elastic vibrations. The emergence of a Bragg-type bandgap when constructing a two-dimensional plate from such unit cells is experimentally validated. It is demonstrated that increasing both mass and porosity of the Schwarz primitive leads to a decrease in the frequency of the out-of-plane propagating wave targeted in this study. By arranging these modified Schwarz primitive unit cells in constant and graded layouts, two-dimensional plates with an embedded metabarrier and a metalens are numerically designed. The metabarrier protects an interior area of the plate from the propagating waves on a wide frequency band (approx. 1.4–3.4 kHz). Equally, the refractive index profile necessary for gradient index lenses is obtained via a progressive variation of the added mass or, alternatively, the porosity of the unit cell over a rectangular area. For the first time, bending of the out-of-plane mode towards the focusing point is practically validated in a challenging mesoscale experiment requiring the assembly of different three-dimensional printed sections of the plate. The increased porosity design is advantageous not only in terms of overall lightweight, but also towards additive manufacturing as it requires less material. This article is part of the theme issue ‘Current developments in elastic and acoustic metamaterials science (Part 1)’.

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