Dynamical correlations near dislocation jamming

Details Dynamical correlations near dislocation jamming Dynamical correlations near dislocation jamming

2010-02-12

arxiv.org/abs/1002.2587v1

Phys. Rev. Lett. 105, 015501 (2010)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures

Scientific paper

Dislocation assemblies exhibit a jamming or yielding transition at a critical external shear stress value $\sigma=\sigma_c$. Nevertheless the nature of this transition has not been ascertained. Here we study the heterogeneous and collective nature of dislocation dynamics within a crystal plasticity model close to $\sigma_c$, 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 {\it dynamical} susceptibility $\chi_4^*$ diverges as $\chi_4^* \sim (\sigma-\sigma_c)^{-\alpha}$, with $\alpha \approx 1.1$. 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 $\xi_y$ in the direction perpendicular to the dislocation glide motion.

Affiliated with

Also associated with

No associations

Rating

Dynamical correlations near dislocation jamming does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dynamical correlations near dislocation jamming, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamical correlations near dislocation jamming will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-420548