Separation of Elastic and Plastic Timescales in a Phase Field Crystal Model

Audun Skaugen, Luiza Angheluta, Jorge Viñals

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


A consistent small-scale description of plasticity and dislocation motion in a crystalline solid is presented based on the phase field crystal description. By allowing for independent mass motion and lattice distortion, the crystal can maintain elastic equilibrium on the timescale of plastic motion. We show that the singular (incompatible) strains are determined by the phase field crystal density, while the smooth distortions are constrained to satisfy elastic equilibrium. A numerical implementation of the model is presented and used to study a benchmark problem: the motion of an edge dislocation dipole in a triangular lattice. The time dependence of the dipole separation agrees with continuum elasticity with no adjustable parameters.

Original languageEnglish (US)
Article number255501
JournalPhysical review letters
Issue number25
StatePublished - Dec 17 2018

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