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Dislocation jamming and Andrade creep
Miguel López, María del Carmen; Vespignani, Alessandro, 1965-; Zaiser, Michael; Zapperi, Stefano
Universitat de Barcelona
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 Andrades 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.
06-07-2010
Ciència dels materials
Cristal·lografia
Resistència de materials
Dislocacions en cristalls
Materials science
Crystallography
Strength of materials
Dislocations in crystals
(c) American Physical Society, 2002
Artículo
American Physical Society
         

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