Convergence of interaction-driven evolutions of dislocations with Wasserstein dissipation and slip-plane confinement

M.G. Mora, M.A. Peletier, L. Scardia

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Abstract

We consider systems of n parallel edge dislocations in a single slip system, represented by points in a two-dimensional domain; the elastic medium is modeled as a continuum. We formulate the energy of this system in terms of the empirical measure of the dislocations and prove several convergence results in the limit n → ∞. The main aim of the paper is to study the convergence of the evolution of the empirical measure as n → ∞. We consider rate-independent, quasi-static evolutions, in which the motion of the dislocations is restricted to the same slip plane. This leads to a formulation of the quasi-static evolution problem in terms of a modified Wasserstein distance, which is only finite when the transport plan is slip-plane-confined. Since the focus is on interaction between dislocations, we renormalize the elastic energy to remove the potentially large self- or core energy. We prove Gamma-convergence of this renormalized energy, and we construct joint recovery sequences for which both the energies and the modified distances converge. With this augmented Gamma-convergence we prove the convergence of the quasi-static evolutions as n → ∞.

Original languageEnglish
Pages (from-to)4149-4205
Number of pages57
JournalSIAM Journal on Mathematical Analysis
Volume49
Issue number5
DOIs
Publication statusPublished - 2017

Keywords

  • Dislocations
  • Rate-independent
  • Slip-plane confinement
  • Wasserstein distance

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