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

作者：Li R; Picu R C^*; Weiss J

来源：Physical Review E, 2010, 82(2): 022107.

DOI：10.1103/PhysRevE.82.022107

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.

• 出版日期2010-8-31