On the band gap formation in locally-resonant metamaterial thin-walled beams

Burlon, Andrea; Failla, Giuseppe

doi:10.1016/j.euromechsol.2022.104798

Cited by 15 publications

(2 citation statements)

References 38 publications

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“…In recent years, periodic structures based on the local resonance mechanism have received much attention by many scholars. It can manipulate elastic waves on subwavelength scales, and has been extensively implemented in beams [33,34], plates [35,36], wave barriers [37,38], acoustic isolation panels [39] and metasurfaces [40,41]. Regretfully, these studies do not cover the vibration mitigation performance of periodic barriers in unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

Broadband surface wave manipulation by periodic barriers in unsaturated soil

Wu,

Shi

2024

Phil. Trans. R. Soc. A.

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Periodic wave barriers have been widely used to manipulate elastic waves propagating in saturated and single-phase soil due to their attenuation zone properties. However, it is difficult to promote application of periodic barriers in unsaturated soils due to their complex constitutive relationship. In this study, manipulation of surface waves by periodic in-filled trench barriers in unsaturated soil has been studied based on the periodic theory. The dispersion relations of a periodic structure for surface waves in unsaturated soil are determined. The attenuation mechanism of evanescent surface waves is revealed. Next, the effects of several key parameters of unsaturated soil on the attenuation zones of the periodic in-filled trench barriers are comprehensively discussed. It is found that in a particular range for material parameter, the surface waves are attenuated over the entire frequency range due to the viscosity of fluid. Finally, a periodic in-filled trench barrier is designed according to a field test of ground vibration induced by a train, and its performances in mitigating surface waves propagating in unsaturated and saturated soils are conducted and compared by conducting analysis in time domain. This investigation provides a new insight for manipulating surface waves by periodic barriers. This article is part of the theme issue ‘Current developments in elastic and acoustic metamaterials science (Part 1)’.

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Section: Introductionmentioning

confidence: 99%

Broadband surface wave manipulation by periodic barriers in unsaturated soil

Wu,

Shi

2024

Phil. Trans. R. Soc. A.

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“…Such nonlinear phenomena, frequently occurring at the microstructural level and drastically influencing the metamaterial macroscopic behaviour, consist of fracture phenomena, decohesion at the interfaces between different microconstituents, matrix cavitation, contact under compression and instabilities that can compromise the unconventional characteristics and multifunctionality of the metamaterials. Moreover, there has been a growing interest in investigating the dynamic and wave propagation characteristics of periodic microstructured metamaterials [6,7]. This interest arises from the periodicity of the microstructure, which can intrinsically influence the propagation of elastic waves.…”

Section: Introductionmentioning

confidence: 99%

Effects of interfacial debonding on the stability of finitely strained periodic microstructured elastic composites

Greco,

Luciano,

Pranno

2024

Phil. Trans. R. Soc. A.

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Predicting failure initiation in nonlinear composite materials, often referred to as metamaterials, is a fundamental challenge in nonlinear solid mechanics. Microstructural failure mechanisms encompass fracture, decohesion, cavitation, compression-induced contact and instabilities, affecting their unconventional static and dynamic performances. To fully take advantage of these materials, especially in extreme applications, it is imperative to predict their nonlinear behaviour using reliable, accurate and computationally efficient numerical methodologies. This study presents an innovative nonlinear homogenization-based theoretical framework for characterizing the failure behaviour of periodic reinforced hyperelastic composites induced by reinforcement/matrix decohesion and interaction between contact mechanisms and microscopic instabilities. Debonding and unilateral contact between different phases are incorporated by employing an enhanced cohesive/contact model, which features a special nonlinear interface constitutive law and an accurate contact formulation within the context of finite strain continuum mechanics. The theoretical formulation is demonstrated using periodically layered composites subjected to macroscopic compressive loading conditions along the lamination direction. Numerical results illustrate the ways in which debonding phenomena, in conjunction with fibre microbuckling, may influence the critical loads of the examined composite solid. The sensitivity of the results obtained through the proposed contact–cohesive model at finite strain with respect to its implementation is also explored. This article is part of the theme issue ‘Current developments in elastic and acoustic metamaterials science (Part 1)’.

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