Elastic metamaterials for independent realization of negativity in density and stiffness

In this paper, we present the realization of an elastic metamaterial allowing independent tuning of negative density and stiffness for elastic waves propagating along a designated direction. In electromagnetic (or acoustic) metamaterials, it is now possible to tune permittivity (bulk modulus) and pe...

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Bibliographic Details
Main Authors Oh, Joo Hwan, Kwon, Young Eui, Lee, Hyung Jin, Kim, Yoon Young
Format Journal Article
LanguageEnglish
Published 13.01.2016
Subjects
Physics - Materials Science
Physics - Other Condensed Matter
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Summary:In this paper, we present the realization of an elastic metamaterial allowing independent tuning of negative density and stiffness for elastic waves propagating along a designated direction. In electromagnetic (or acoustic) metamaterials, it is now possible to tune permittivity (bulk modulus) and permeability (density) independently. Apparently, the tuning methods seem to be directly applicable for elastic case, but no realization has yet been made due to the unique tensorial physics of elasticity that makes wave motions coupled in a peculiar way. To realize independent tunability, we developed a single-phased elastic metamaterial supported by theoretical analysis and numerical/experimental validations.
DOI:10.48550/arxiv.1601.03252