Hilbert fractal acoustic metamaterials with negative mass density and bulk modulus on subwavelength scale

Man, X; Luo, Z; Liu, J; Xia, B

Hilbert fractal acoustic metamaterials with negative mass density and bulk modulus on subwavelength scale

Man, X

Luo, Z

Liu, J Xia, B

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Publication Type:: Journal Article
Citation:: Materials and Design, 2019, 180
Issue Date:: 2019-10-15

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Field	Value	Language
dc.contributor.author	Man, X https://orcid.org/0000-0002-4181-5885	en_US
dc.contributor.author	Luo, Z https://orcid.org/0000-0002-6953-3986	en_US
dc.contributor.author	Liu, J	en_US
dc.contributor.author	Xia, B	en_US
dc.date.issued	2019-10-15	en_US
dc.identifier.citation	Materials and Design, 2019, 180	en_US
dc.identifier.issn	0264-1275	en_US
dc.identifier.uri	http://hdl.handle.net/10453/133928
dc.description.abstract	© 2019 The Authors Acoustic metamaterials (AMs) are artificially engineered composite materials, structured to have unconventional effective properties for flexibly manipulating the wave propagation, which can produce a broad range of applications such as sound cloaking and tunneling. In nature, bio-inspired fractal organization with multiple length scales has been found in various biological materials, which display enhanced dynamic properties. By introducing Hilbert curve channels, this work will design a class of topological architectures of Hilbert fractal acoustic metamaterials (HFAMs) with negative mass density and bulk modulus on subwavelength scale. In this paper, we will highlight the influences of the self-similar fractal configurations on multipole modes of HFAM. To further demonstrate multipole resonances, the pressure magnifications are assessed in the center region of HFAM with losses. Moreover, based on effective medium theory, we systematically calculate and investigate effective bulk modulus and mass density, as well as density-near-zero of HFAM, to demonstrate the negative properties and the zero-phase-difference effects of HFAMs. Numerical results show that HFAM can enable a number of applications, from sound blocking, quarter bending, sound cloaking to sound tunneling, and may further provide a possibility for the engineering guidances of the exotic properties on subwavelength scale.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DP160102491
dc.relation.ispartof	Materials and Design	en_US
dc.relation.isbasedon	10.1016/j.matdes.2019.107911	en_US
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	Materials	en_US
dc.title	Hilbert fractal acoustic metamaterials with negative mass density and bulk modulus on subwavelength scale	en_US
dc.type	Journal Article
utslib.citation.volume	180	en_US
utslib.for	091307 Numerical Modelling and Mechanical Characterisation	en_US
utslib.for	0910 Manufacturing Engineering	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0913 Mechanical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	open_access	*
pubs.publication-status	Published	en_US
pubs.volume	180	en_US

Abstract:

© 2019 The Authors Acoustic metamaterials (AMs) are artificially engineered composite materials, structured to have unconventional effective properties for flexibly manipulating the wave propagation, which can produce a broad range of applications such as sound cloaking and tunneling. In nature, bio-inspired fractal organization with multiple length scales has been found in various biological materials, which display enhanced dynamic properties. By introducing Hilbert curve channels, this work will design a class of topological architectures of Hilbert fractal acoustic metamaterials (HFAMs) with negative mass density and bulk modulus on subwavelength scale. In this paper, we will highlight the influences of the self-similar fractal configurations on multipole modes of HFAM. To further demonstrate multipole resonances, the pressure magnifications are assessed in the center region of HFAM with losses. Moreover, based on effective medium theory, we systematically calculate and investigate effective bulk modulus and mass density, as well as density-near-zero of HFAM, to demonstrate the negative properties and the zero-phase-difference effects of HFAMs. Numerical results show that HFAM can enable a number of applications, from sound blocking, quarter bending, sound cloaking to sound tunneling, and may further provide a possibility for the engineering guidances of the exotic properties on subwavelength scale.

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http://hdl.handle.net/10453/133928