Dislocation jamming and Andrade creep

Title:
Dislocation jamming and Andrade creep
Creator:
Miguel, M C (Author)
Vespignani, A (Author)
Zaiser, M (Author)
Zapperi, S (Author)
Language:
English
Publisher:
American Physical Society
Copyright date:
2002
Type of resource:
Text
Genre:
Articles
Format:
electronic
Digital origin:
born digital
Abstract/Description:
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.
Comments:
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.
Subjects and keywords:
Dislocations in crystals
Plastic crystals
Andrade's law
shear stress
creep relaxation
dislocation jamming
Physics
Permanent Link:
http://hdl.handle.net/2047/d20002153

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