A design of active elastic metamaterials with negative mass density and tunable bulk modulus

2018 ◽  
Vol 230 (3) ◽  
pp. 1003-1008 ◽  
Author(s):  
Sheng Sang ◽  
Anwer Mhannawee ◽  
Ziping Wang
Keyword(s):  
Bulk Modulus ◽  
Mass Density ◽  
Negative Mass ◽  
Elastic Metamaterials

An elastic metamaterial with simultaneously negative mass density and bulk modulus

2011 ◽  
Vol 98 (25) ◽  
pp. 251907 ◽  
Author(s):  
X. N. Liu ◽  
G. K. Hu ◽  
G. L. Huang ◽  
C. T. Sun
Keyword(s):  
Bulk Modulus ◽  
Mass Density ◽  
Negative Mass

scholarly journals Hilbert fractal acoustic metamaterials with negative mass density and bulk modulus on subwavelength scale

2019 ◽  
Vol 180 ◽  
pp. 107911 ◽  
Author(s):  
Xianfeng Man ◽  
Zhen Luo ◽  
Jian Liu ◽  
Baizhan Xia
Keyword(s):  
Bulk Modulus ◽  
Mass Density ◽  
Acoustic Metamaterials ◽  
Negative Mass

scholarly journals Coupled Membranes with Doubly Negative Mass Density and Bulk Modulus

2013 ◽  
Vol 110 (13) ◽  
Author(s):  
Min Yang ◽  
Guancong Ma ◽  
Zhiyu Yang ◽  
Ping Sheng
Keyword(s):  
Bulk Modulus ◽  
Mass Density ◽  
Negative Mass

Novel negative mass density resonant metamaterial unit cell

2015 ◽  
Vol 379 (1-2) ◽  
pp. 33-36 ◽  
Author(s):  
Norbert Cselyuszka ◽  
Milan Sečujski ◽  
Vesna Crnojević-Bengin
Keyword(s):  
Mass Density ◽  
Unit Cell ◽  
Negative Mass

EFFECTS OF STOICHIOMETRY ON PROPERTIES OF DGEBF/DETDA EPOXY USING MOLECULAR DYNAMICS

2021 ◽  
Author(s):  
SAGAR PATIL ◽  
MICHAEL OLAYA ◽  
PRATHAMESH DESHPANDE ◽  
MARIANNA MAIARÙ ◽  
GREGORY ODEGARD
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Molecular Modeling ◽  
Bulk Modulus ◽  
Mass Density ◽  
Strong Dependence ◽  
Crosslinking Density ◽  
Mechanical Deformation ◽  
Epoxy System ◽  
Reactive Interface

This article details the molecular modeling of full and off-stoichiometry models of the DGEBF/DETDA epoxy system using Molecular Dynamics to predict the mechanical properties as a function of the crosslinking density. The Reactive Interface Force Field (IFF-R) is implemented in this work to simulate mechanical deformation. The “fix bond/react” command in LAMMPS is used to simulate crosslinking between epoxy monomers. The results show that the predicted mass density, volumetric shrinkage, and bulk modulus have a strong dependence on the stoichiometry of the epoxy.

Silicon Pillars as Resonators in an Acoustical Metamaterial

2014 ◽  
Author(s):  
Bernard Bonello ◽  
Rémi Marchal ◽  
Rayisa Moiseyenko ◽  
Yan Pennec ◽  
Bahram Djafari-Rouhani ◽  
...  
Keyword(s):  
Thin Plate ◽  
Lamb Waves ◽  
Mass Density ◽  
Resonant Mode ◽  
Ultrasonic Technique ◽  
Frequency Range ◽  
Negative Mass ◽  
Laser Ultrasonic ◽  
Compressional Mode ◽  
Bending Modes

We have investigated the propagation of Lamb waves in structures made of either an isolated resonant pillar or a set of pillars arranged in a line on a thin plate. The resonators as well as the plate are made of silicon. FEM computations show that two bending modes and one compressional mode are unambiguously identified in the frequency range of interest (0–10 MHz). We used a laser ultrasonic technique to map both the amplitude and the phase of the normal displacements on top of the pillars and at the surface of the sample. When the frequency is tuned to a resonant mode, either compressional or bending, the pillars vibrate 180° out-of-phase with respect to the Lamb waves, resulting in a negative modulus or negative mass density respectively.

Metamaterial with Simultaneously Negative Bulk Modulus and Mass Density

2007 ◽  
Vol 99 (9) ◽  
Author(s):  
Yiqun Ding ◽  
Zhengyou Liu ◽  
Chunyin Qiu ◽  
Jing Shi
Keyword(s):  
Bulk Modulus ◽  
Mass Density
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