Physics – Condensed Matter – Materials Science
Scientific paper
2010-04-12
Phys. Rev. Lett. 105, 085503 (2010)
Physics
Condensed Matter
Materials Science
5 pages
Scientific paper
10.1103/PhysRevLett.105.085503
The existence of a well defined yield stress, where a macroscopic piece of crystal begins to plastically flow, has been one of the basic observations of materials science. In contrast to macroscopic samples, in micro- and nanocrystals the strain accumulates in distinct, unpredictable bursts, which makes controlled plastic forming rather difficult. Here we study by simulation, in two and three dimensions, plastic deformation of submicron objects under increasing stress. We show that, while the stress-strain relation of individual samples exhibits jumps, its average and mean deviation still specify a well-defined critical stress, which we identify with the jamming-flowing transition. The statistical background of this phenomenon is analyzed through the velocity distribution of short dislocation segments, revealing a universal cubic decay and an appearance of a shoulder due to dislocation avalanches. Our results can help to understand the jamming-flowing transition exhibited by a series of various physical systems.
Csikor Ferenc F.
Groma Istvan
Gyorgyi Géza
Ispánovity Péter Dusán
Weygand Daniel
No associations
LandOfFree
Submicron plasticity: yield stress, dislocation avalanches, and velocity distribution 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 Submicron plasticity: yield stress, dislocation avalanches, and velocity distribution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Submicron plasticity: yield stress, dislocation avalanches, and velocity distribution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-262990