An improved method to model dislocation self-climb

Fengxian Liu, Alan Cocks, Simon P.A. Gill, Edmund Tarleton*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)
14 Downloads (Pure)


Dislocations can provide short circuit diffusion paths for atoms resulting in a dislocation climb motion referred to as self-climb. A variational principle is presented for the analysis of problems in which fast dislocation core diffusion is the dominant mechanism for material redistribution. The linear element based self-climb model, developed in our previous work [1] Liu, Cocks and Tarleton (2020 J. Mech. Phys. Solids 135 103783), is significantly accelerated here, by employing a new finite element discretisation method. The speed-up in computation enables us to use the self-climb model as an effective numerical technique to simulate emergent dislocation behaviour involving both self-climb and glide. The formation of prismatic loops from the break-up of different types of edge dislocation dipoles are investigated based on this new method. We demonstrate that edge dipoles sequentially pinch-off prismatic loops, rather than spontaneously breaking-up into a string of loops, to rapidly decrease the total dislocation energy.

Original languageEnglish
Article number055012
Number of pages21
JournalModelling and simulation in materials science and engineering
Issue number5
Publication statusPublished - 4 Jun 2020


  • Core diffusion
  • Pipe diffusion
  • Self-climb
  • Variational principle
  • n/a OA procedure


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