Zobrazeno 1 - 10
of 332
pro vyhledávání: '"Prada, Claire"'
Autor:
Delory, Alexandre, Prada, Claire, Lanoy, Maxime, Eddi, Antonin, Fink, Mathias, Lemoult, Fabrice
The interaction between waves and evolving media challenges traditional conservation laws. We experimentally investigate the behavior of elastic wave packets crossing a moving interface that separates two media with distinct propagation properties, o
Externí odkaz:
http://arxiv.org/abs/2406.15100
Guided wave dispersion is commonly assessed by Fourier analysis of the field along a line, resulting in frequency-wavenumber dispersion curves. In anisotropic plates, a point source can generate multiple dispersion branches pertaining to the same mod
Externí odkaz:
http://arxiv.org/abs/2403.05317
Autor:
Goïcoechea, Antton, Brütt, Cécile, Ber, Arthur Le, Bureau, Flavien, Lambert, William, Prada, Claire, Derode, Arnaud, Aubry, Alexandre
Publikováno v:
Phys. Rev. Lett. 133, 176301, 2024
Multiple scattering of waves presents challenges for imaging complex media but offers potential for their characterization. Its onset is actually governed by the scattering mean free path $\ell_s$ that provides crucial information on the medium micro
Externí odkaz:
http://arxiv.org/abs/2401.02246
Objective - Shear wave elastography has enriched ultrasound medical imaging with quantitative measurements of tissue stiffness. However, this method still suffers from some limitations due to viscoelasticity, guiding geometry or static deformations.
Externí odkaz:
http://arxiv.org/abs/2312.14854
Autor:
Delory, Alexandre, Kiefer, Daniel A., Lanoy, Maxime, Eddi, Antonin, Prada, Claire, Lemoult, Fabrice
To produce sounds, we adjust the tension of our vocal folds to shape their properties and control the pitch. This efficient mechanism offers inspiration for designing reconfigurable materials and adaptable soft robots. However, understanding how flex
Externí odkaz:
http://arxiv.org/abs/2310.11396
Publikováno v:
Science Advances, 9 (51), p. eadk6846, Dec. 2023
Elastic waves in anisotropic media can exhibit a power flux that is not collinear with the wave vector. This has notable consequences for waves guided in a plate. Through laser-ultrasonic experiments, we evidence remarkable phenomena due to slow wave
Externí odkaz:
http://arxiv.org/abs/2307.14259
Publikováno v:
The Journal of the Acoustical Society of America, vol. 153, no. 2, pp. 1386-1398, Feb. 2023
Dispersion curves of elastic waveguides exhibit points where the group velocity vanishes while the wavenumber remains finite. These are the so-called zero-group-velocity (ZGV) points. As the elastodynamic energy at these points remains confined close
Externí odkaz:
http://arxiv.org/abs/2211.01995
Publikováno v:
Extreme Mechanics Letters, Volume 61, 2023, 102018
We study the propagation of guided elastic waves in a highly-stretched Ecoflex\c{opyright} plate, a nearly incompressible elastomer. The plate is subjected to a nearly-uniaxial stress with an elongation reaching 120% and we measure in-plane displacem
Externí odkaz:
http://arxiv.org/abs/2209.00926
Publikováno v:
Phys. Rev. E, 106, 025001, 2022
In a heterogeneous medium, the wavefield can be decomposed as an infinite series known as the Born expansion. Each term of the Born expansion corresponds to a scattering order, it is thus theoretically possible to discriminate single and multiple sca
Externí odkaz:
http://arxiv.org/abs/2203.15411
Autor:
Legrand, François, Gérardin, Benoît, Bruno, François, Laurent, Jérôme, Lemoult, Fabrice, Prada, Claire, Aubry, Alexandre
Publikováno v:
Sci. Rep. 11, 23901, 2021
We report on experimental and numerical implementations of devices based on the negative refraction of elastic guided waves, the so-called Lamb waves. Consisting in plates of varying thickness, these devices rely on the concept of complementary media
Externí odkaz:
http://arxiv.org/abs/2102.08831