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.
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
Permanent URL
Recommended Citation
Miguel, M C.; Vespignani, A; Zaiser, M; and Zapperi, S, "Dislocation jamming and Andrade creep" (2002). Physics Faculty Publications. Paper 193. http://hdl.handle.net/2047/d20002153
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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.