Dynamics below the depinning transition of interacting dislocations moving over fields of obstacles

R. Li , R. C. Picu , J. Weiss (1)

1 EDGe

The transition from the behavior of a single dislocation interacting with a field of fixed obstacles to the collective motion of multiple dislocations is studied below the depinning transition (thermally activated glide). In absence of interactions, a truncated power law distribution of jump amplitudes (avalanches) with a diverging cutoff toward the critical point, and intermittency are observed. Interactions lead to a modification of the correlation length exponent below the critical point and to more pronounced intermittency, a dynamics more compatible to acoustic emission experimental data.

Keywords: Random phenomena and media; Direct observation of dislocations and other defects

Domains: Glaciology

R. Li, R. C. Picu, J. Weiss. Dynamics below the depinning transition of interacting dislocations moving over fields of obstacles. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2010, 82 (2), pp.022107. ⟨10.1103/PHYSREVE.82.022107⟩. ⟨insu-00562241⟩