Abstract

We simulate the glide motion of an assembly of interacting dislocations under the action of an external shear stress and show that the associated plastic creep relaxation follows Andrade's law. Our results indicate that Andrade creep in plastically deforming crystals involves the correlated motion of dislocation structures near a dynamic transition separating a flowing from a jammed phase. Simulations in the presence of dislocation multiplication and noise confirm the robustness of this finding and highlight the importance of metastable structure formation for the relaxation process.

Notes

Originally published in Physical Review Letters, v.89 no.16 (2002), 165501. DOI:10.1103/PhysRevLett.89.165501. Dr. Vespignani is affiliated with Northeastern University as of the time of deposit.

Keywords

Andrade's law, shear stress, creep relaxation, dislocation jamming

Subject Categories

Dislocations in crystals, Plastic crystals

Disciplines

Physics

Publisher

American Physical Society

Publication Date

10-14-2002

Rights Information

©2002 American Physical Society

Rights Holder

American Physical Society

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