Bio-inspired non self-similar hierarchical elastic metamaterials
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Date
2023-03-01
Publication Type
Journal Article
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yes
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Abstract
Hierarchy provides unique opportunities for the design of advanced materials with superior properties that arise from architecture, rather than from constitutive material response. Contrary to the quasi-static regime, where the potential of hierarchy has been largely explored, its role in vibration mitigation and wave manipulation remains elusive. So far, the majority of the studies concerning hierarchical elastic metamaterials have proposed a self-similar repetition of a specific unit cell at multiple scale levels, leading to the activation of the same bandgap mechanism at different frequencies. On the contrary, here, we show that by designing non self-similar hierarchical geometries allows us to create periodic structures supporting multiple, highly attenuative and broadband bandgaps involving (independently or simultaneously) different scattering mechanisms, namely, Bragg scattering, local resonance and/or inertial amplification, at different frequencies. The type of band gap mechanism is identified and discussed by examining the vibrational mode shapes and the imaginary component of the wavenumber in the dispersion diagram of the unit cell. We also experimentally confirm this by performing measurements in the lowest frequency regime on a 3D printed structure. Hierarchical design strategies may find application in vibration mitigation for civil, aerospace and mechanical engineering.
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Publication status
published
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Book title
Journal / series
Volume
241
Pages / Article No.
107915
Publisher
Elsevier
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Edition / version
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Software
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Date collected
Date created
Subject
Phononic crystals and metamaterials; Hierarchical structures; Wave propagation
Organisational unit
Notes
Funding
863179 - Bio-Inspired Hierarchical MetaMaterials (EC)