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Continuum constitutive laws to describe acoustic attenuation in glasses
- Source :
- Physical Review E, Physical Review E, American Physical Society (APS), 2020, 102 (3), pp.033003. ⟨10.1103/PhysRevE.102.033003⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- International audience; Nowadays metamaterials are at the focus of an intense research as promising for thermal and acoustic engineering. However, the computational cost associated to the large system size required for correctly simulating them imposes the use of finite-elements simulations, developing continuum models, able to grasp the physics at play without entering in the atomistic details. Still, a correct description should be able to reproduce not only the extrinsic scattering sources on waves propagation, as introduced by the metamaterial microstructure, but also the intrinsic wave attenuation of the material itself. This becomes dramatically important when the metamaterial is made out of a glass, which is intrinsically highly dissipative and with a wave attenuation strongly dependent on frequency. Here we propose a continuum mechanical model for a viscoelastic medium, able to bridge atomic and macroscopic scale in amorphous materials and describe phonon attenuation due to atomistic mechanisms, characterized by a defined frequency dependence. This represents a first decisive step for investigating the effect of a complex nano- or microstructure on acoustic attenuation, while including the atomistic contribution as well.
- Subjects :
- Physics
[PHYS]Physics [physics]
Phonon
Scattering
Attenuation
Glasses
Metamaterial
Mechanics
01 natural sciences
Viscoelasticity
010305 fluids & plasmas
Mechanical & acoustical properties
Amorphous materials
[SPI]Engineering Sciences [physics]
Macroscopic scale
0103 physical sciences
Dissipative system
[CHIM]Chemical Sciences
Acoustic phonons
010306 general physics
Acoustic modeling
Acoustic attenuation
Subjects
Details
- Language :
- English
- ISSN :
- 24700045 and 24700053
- Database :
- OpenAIRE
- Journal :
- Physical Review E, Physical Review E, American Physical Society (APS), 2020, 102 (3), pp.033003. ⟨10.1103/PhysRevE.102.033003⟩
- Accession number :
- edsair.doi.dedup.....ba309d4b86b51d2183247f8a26811cab