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Dynamical correlations near dislocation jamming
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Dislocation assemblies exhibit a jamming or yielding transition at a critical external shear stress value ¼ c. Here we study the heterogeneous and collective nature of dislocation dynamics within a crystal plasticity model close to c, by considering the first-passage properties of the dislocation dynamics. As the transition is approached in the moving phase, the first-passage time distribution exhibits scaling, and a related peak dynamical susceptibility 4 diverges as 4 ð cÞ , with 1:1. We relate this scaling to an avalanche description of the dynamics. While the static structural correlations are found to be independent of the external stress, we identify a diverging dynamical correlation length y in the direction perpendicular to the dislocation glide motion.
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LAURSON, Lasse, MIGUEL LÓPEZ, María del Carmen and ALAVA, Mikko J. Dynamical correlations near dislocation jamming. Physical Review Letters. 2010. Vol. 105, num. 015501. ISSN 0031-9007. [consulted: 29 of May of 2026]. Available at: https://hdl.handle.net/2445/125547