Elastic Metamaterials with Simultaneously Negative Effective Shear Modulus and Mass Density

Ying Wu, Yun Lai, Zhao-Qing Zhang

Research output: Contribution to journalArticlepeer-review

206 Scopus citations

Abstract

We propose a type of elastic metamaterial comprising fluid-solid composite inclusions which can possess a negative shear modulus and negative mass density over a large frequency region. Such a material has the unique property that only transverse waves can propagate with a negative dispersion while longitudinal waves are forbidden. This leads to many interesting phenomena such as negative refraction, which is demonstrated by using a wedge sample and a significant amount of mode conversion from transverse waves to longitudinal waves that cannot occur on the interface of two natural solids.
Original languageEnglish (US)
JournalPhysical Review Letters
Volume107
Issue number10
DOIs
StatePublished - Sep 2 2011

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