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Related Experiment Videos

Dislocation jamming and andrade creep.

M-Carmen Miguel1, Alessandro Vespignani, Michael Zaiser

  • 1Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona, Avinguda Diagonal 647, Spain.

Physical Review Letters
|October 26, 2002
PubMed
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Plastic deformation in crystals follows Andrade

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid Mechanics

Background:

  • Plastic deformation is a fundamental property of crystalline materials.
  • Creep, a time-dependent deformation, is crucial for understanding material behavior under stress.
  • Andrade's law describes a specific type of creep relaxation observed in many materials.

Purpose of the Study:

  • To investigate the microscopic mechanisms underlying Andrade creep in plastically deforming crystals.
  • To explore the role of interacting dislocations in plastic creep relaxation.
  • To determine if dislocation dynamics simulations can reproduce Andrade's law.

Main Methods:

  • Simulated the glide motion of interacting dislocations under external shear stress.
  • Employed discrete dislocation dynamics (DDD) simulations.

Related Experiment Videos

  • Introduced dislocation multiplication and noise to test robustness.

    • Main Results:

    • Plastic creep relaxation associated with dislocation glide follows Andrade's law.
    • Andrade creep involves correlated motion of dislocation structures near a dynamic phase transition (flowing vs. jammed).
    • Metastable structure formation is critical for the relaxation process.

    Conclusions:

    • Andrade creep in plastically deforming crystals is explained by the collective behavior of dislocations.
    • The findings link macroscopic creep behavior to microscopic dislocation dynamics and phase transitions.
    • Dislocation multiplication and noise do not alter the fundamental mechanism of Andrade creep.