Dynamics below the depinning transition of interacting dislocations moving over fields of obstacles.
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.
Li
R
R
Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
Picu
R C
RC
Weiss
J
J
D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D006358:Hot Temperature; D008956:Models, Chemical; D009038:Motion; D044367:Phase Transition; D011108:Polymers / Q000737:chemistry*
D011108:Polymers