Open AccessA Kind of Triple-negative Elastic Metamaterial
Author(s) -
X Wang,
Shui Wan
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/831/1/012001
Subject(s) - metamaterial , negative mass , negative refraction , range (aeronautics) , shear modulus , condensed matter physics , physics , transverse plane , band gap , low frequency , modulus , bulk modulus , frequency band , optics , vibration , materials science , classical mechanics , acoustics , structural engineering , telecommunications , composite material , bandwidth (computing) , engineering , astronomy , thermodynamics
In this paper, a kind of triple-negative elastic metamaterial (EMM) is proposed, which means it possesses negative equivalent mass density, negative equivalent bulk modulus, negative equivalent shear modulus in the same frequency range simultaneously, and can realize negative refraction of both transverse and longitudinal waves. Furthermore, the influence of rectangular oscillators and semi elliptical oscillators on the band structure is analysed, and we find that the unit cell with semi elliptical oscillators has a much wider band gap, which has a potential in supressing vibration at a wide frequency range.