NDLI: Anisotropic Band Gap in a 2D Acoustic Metamaterial

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Huang, H. H. Sun, C. T.
Copyright Year	2009
Abstract	A two-dimensional (2D) metamaterial possessing an effective anisotropic mass is investigated. This metamaterial is a composite material in the form of an internal mass connected in two directions to the host medium. A 2D mass-in-mass lattice model is used to characterize the dynamic behavior of the metamaterial. If modeled as an effective spring-mass lattice system, the metamaterial may possess a frequency-dependent effective mass. Moreover, if an equivalent homogenous elastic continuum is used to represent the metamaterial, an anisotropic mass density may result and may assume negative values for wave frequencies that are near the local resonance frequency of the internal mass. In fact, it was found that negative mass density occurs in the band-gap of the metamaterial. Unusual wave motion arises from the anisotropic band gap structure. In the present study, wave propagation in the representative continuum model for the metamaterial is studied in order to understand the unusual features of the dynamic behavior of the metamaterial.
Starting Page	93
Ending Page	96
Page Count	4
File Format	PDF
ISBN	9780791843888
DOI	10.1115/IMECE2009-10600
e-ISBN	9780791838631
Volume Number	Volume 15: Sound, Vibration and Design
Conference Proceedings	ASME 2009 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2009-11-13
Publisher Place	Lake Buena Vista, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Phononic crystals Energy gap Composite materials Wave propagation Anisotropy Wave motion Wave frequency Metamaterials Resonance Density Springs
Content Type	Text
Resource Type	Article

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