title: Creep of sound paths in consolidated granular material detected through coda wave interferometry.
abstract: The time evolution of the contact force structure of a consolidated granular material subjected to a constant stress is monitored using the coda wave interferometry method. In addition, the nature of the aging and rejuvenation processes are investigated. These processes are interpreted in terms of affine and nonaffine structural path deformations. During the later stages of creep, the rearrangements of subgrains are so small that they only produce affine deformations in the contact paths, without any significant changes in the structural configuration. As a result, the strain path distribution follows the macroscopic strain. Conversely, in the presence of ultrasonic perturbations, the nonaffine grain buckling mechanism dominates, producing relatively drastic changes in the structural configuration accompanied by path deformations of the order of the grain size. This plastic mechanism induces material rejuvenation that is observed macroscopically as an ultrasonically accelerated creep.
authors: Departamento de Física, Universidad de Santiago de Chile, Av. Ecuador 3493, Casilla 307, Correo 2, Santiago, Chile.|Sorbonne Universités, UPMC Université Paris 06, CNRS UMR 7190, Institut Jean Le Rond d'Alembert, F-75005 Paris, France.
authors: David
authors: D
authors: Espíndola
authors: Departamento de Física, Universidad de Santiago de Chile, Av. Ecuador 3493, Casilla 307, Correo 2, Santiago, Chile.
authors: Belfor
authors: B
authors: Galaz
authors: Departamento de Física, Universidad de Santiago de Chile, Av. Ecuador 3493, Casilla 307, Correo 2, Santiago, Chile.
authors: Francisco
authors: F
authors: Melo