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