Title :

Inducing dispersion curves with negative group velocity in inertially amplified phononic crystals through the application of an external state of prestress

Author(s) :

Miniaci, M. [Auteur]
Acoustique - IEMN [ACOUSTIQUE - IEMN]
Mazzotti, M. [Auteur]
Department of Mechanical Engineering [Boulder]
Amendola, A. [Auteur]
University of Salerno [UNISA]
Fraternali, F. [Auteur]
University of Salerno [UNISA]

Conference title :

XI International Conference on Structural Dynamic, EURODYN 2020

City :

Athens

Country :

Grèce

Start date of the conference :

2020-11-23

Book title :

XI International Conference on Structural Dynamic, EURODYN 2020

Journal title :

EASD Procedia

Publication date :

2020

English keyword(s) :

Phononic Crystals and Metamaterials
Prestress / Prestrain
Band Diagram Tunability
Inertial Amplification Mechanism

HAL domain(s) :

Sciences de l'ingénieur [physics]

English abstract : [en]

In this paper, we report about the effect of the application of a state of prestress on the band structure of a periodic phononic crystal characterized by an inertial amplification mechanism. Through a numerical example, ...
Show more >In this paper, we report about the effect of the application of a state of prestress on the band structure of a periodic phononic crystal characterized by an inertial amplification mechanism. Through a numerical example, we show the possibility of inducing negative group velocity in an isolated branch of the dispersion diagram. A 2-step Updated Lagrangian scheme is adopted to calculate the dispersion diagram of the structure. The proposed method include (i) the static geometrically nonlinear analysis of a representative unit cell undergoing the action of an applied external load and (ii) the BlochFloquet decomposition applied to the linearized equations of the acousto-elasticity for the unit cell in the deformed configuration. The dispersion analysis is performed in terms of small amplitude motions superimposed on a deformed state, once the desired load has been applied.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL