Elastic Metamaterials with Simultaneously Negative Effective Shear Modulus and Mass Density

Ying Wu, Yun Lai, Zhao-Qing Zhang

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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
Issue number10
StatePublished - Sep 2 2011

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