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

R. Li R. C. Picu J. Weiss 1 
1 EDGe
LGGE - Laboratoire de glaciologie et géophysique de l'environnement
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.
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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, American Physical Society, 2010, 82 (2), pp.022107. ⟨10.1103/PHYSREVE.82.022107⟩. ⟨insu-00562241⟩

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