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Campo DC | Valor | Lengua/Idioma |
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dc.contributor.author | Gallot, Thomas | - |
dc.contributor.author | Sedofeito, Camila | - |
dc.contributor.author | Ginares, Alejandro | - |
dc.contributor.author | Tancredi Machado, Gonzalo José | - |
dc.date.accessioned | 2022-12-21T17:18:55Z | - |
dc.date.available | 2022-12-21T17:18:55Z | - |
dc.date.issued | 2022 | - |
dc.identifier.citation | Gallot, T, Sedofeito, C, Ginares, A y [otro autor]. "Elastic waves generated by impact and vibration in confined granular media" [Preprint]. Publicado en: Physics (Geophysics), arXiv: 2210.09342, 2022, pp1-14 | es |
dc.identifier.uri | https://hdl.handle.net/20.500.12008/35354 | - |
dc.description | Versión permitida: preprint | es |
dc.description | Enviado a Geophysical Journal International | es |
dc.description.abstract | Observational data of asteroids can be explained by considering them as an agglomerate of granular material. Understanding the mechanical properties of these objects is relevant for many scientific reasons: space missions design, evaluation of impact threats to our planet, and understanding the nature of asteroids and their implication in the origin of the solar system. In-situ measurements of mechanical properties require complex and costly space missions. Here a laboratory-scale characterization of wave propagation in granular media is presented using a novel experimental setup as well as numerical simulations. The pressure inside an asteroid is still a matter of debate, but it definitely presents a pressure gradient towards the interior. This is why impact characterization needs to be performed as a function of the confining pressure. Our experimental setup allows for the simultaneous measurement of the external confining pressure, internal pressure, total strain, and acceleration in a 50 cm side squared box filled up with a billion grains. We study the propagation of impact-generated and shaker-born seismic body waves in the 500 Hz range. Through subsequent compression-relaxation cycles, it was observed that the granular media behaves on average like a solid with a constant elastic modulus during each compression. Effective medium theory (EMT) for granular media explains the data at low pressure. After each compression-relaxation cycle, the elastic modulus increases, and a high hysteresis is observed: relaxation shows a more complex behavior than compression. We show that seismic waves generated by both impact and vibration travels at the pressure wave speed. Thanks to a numerical model, we measure a strong wave attenuation α ∼ 3.4 Np/m. We found that the wave speed increases with the confining pressure with a p1/2 dependency, in disagreement with theoretical models that predicts a shallower dependency. The dependency of the elasticity with the confining pressure can be explained by a modified EMT model with a coordination number proportional to the pressure, or equivalently by a mesoscopic nonlinear model based on third-order nonlinear elastic energy. The interpretation of these models is a deep reorganization in the particle contact network. | es |
dc.description.sponsorship | ANII: FCE_1_ 2019_1_15645 | es |
dc.format.extent | 14 h | es |
dc.format.mimetype | application/pdf | es |
dc.language.iso | en | es |
dc.publisher | arXiv | es |
dc.relation.ispartof | Physics (Geophysics), arXiv: 2210.09342, 2022, pp1-14 | es |
dc.rights | Las obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad de la República.(Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014) | es |
dc.subject | Elasticity and anelasticity | es |
dc.subject | Ex- traterrestrial | es |
dc.subject | Acoustic properties | es |
dc.subject | Wave propagation | es |
dc.subject | Body waves | es |
dc.title | Elastic waves generated by impact and vibration in confined granular media | es |
dc.type | Preprint | es |
dc.contributor.filiacion | Gallot Thomas, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Física. | - |
dc.contributor.filiacion | Sedofeito Camila, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Física. | - |
dc.contributor.filiacion | Ginares Alejandro | - |
dc.contributor.filiacion | Tancredi Machado Gonzalo José, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Física. | - |
dc.rights.licence | Licencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0) | es |
dc.identifier.doi | 10.48550/arXiv.2210.09342 | - |
Aparece en las colecciones: | Publicaciones académicas y científicas - Facultad de Ciencias |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | ||
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Gallot_et al_Elastic.pdf | Preprint | 2,02 MB | Adobe PDF | Visualizar/Abrir |
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