Reduced Linear Constrained Elastic and Viscoelastic Homogeneous Cosserat Media as Acoustic Metamaterials

Acoustic and elastic metamaterials

We will review some of the recent advances in the field of acoustic and elastic metamaterials. These research fields became hot topics in last few years with an increasing number of papers that grows almost exponentially. The interest on these artificial structures arouses because of their potential application in designing novel devices for sound and vibration control. Their applications cover...

Tunable Highly - Nonlinear Acoustic Waves and their coupling with Linear Elastic Media

This project aims at introducing and testing a new method of Non-Destructive Evaluation (NDE) and Structural Health Monitoring (SHM) for materials and engineering systems, based on the use of Highly Nonlinear Acoustic Waves (HNAWs). At a fundamental level the project aims at understanding the interface behavior between linear and highly nonlinear media. The effects of interface dynamics on the ...

Low Frequency Acoustic Devices for Viscoelastic Complex Media Characterization

Programmable Elastic Metamaterials

We introduce a novel concept for the design of programmable-elasticity metamaterials; materials whose elastic properties can be modified instantaneously and reversibly on demand. Real-time tunable linear and nonlinear elastic moduli are obtained in lattice materials by adjustment of strut connectivity via actuation of embedded electromagnetic locks. The Young’s modulus and Poisson’s ratio of pr...

Constitutive model and wave equations for linear, viscoelastic, anisotropic media

Rocks are far from being isotropic and elastic. Such simplifications in modeling the seismic response of real geological structures may lead to misinterpretations, or even worse, to overlooking useful information. It is useless to develop highly accurate modeling algorithms or to naively use amplitude information in inversion processes if the stress-strain relations are based on simplified rheo...