Hybrid atomistic-coarse-grained treatment of multiscale processes in heterogeneous materials

A self-consistent-field approach

D. J. Diestler, H. Zhou, R. Feng, Xiao C Zeng

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A treatment of multiscale quasistatic processes that combines an atomistic description of microscopic heterogeneous ("near") regions of a material with a coarse-grained (quasicontinuum) description of macroscopic homogeneous ("far") regions is presented. The hybrid description yields a reduced system consisting of the original atoms of the near regions plus pseudoatoms (nodes of the coarse-graining mesh) of the far regions, which interact through an effective many-body potential energy V eff that depends on the thermodynamic state. The approximate nature of V eff gives rise to "ghost forces," which are reflected in spurious heterogeneities close to interfaces between near and far regions. The impact of ghost forces, which afflict all previous hybrid schemes, is greatly diminished by a self-consistent-field hybrid atomistic-coarse-grained (SCF-HACG) methodology. Tests of the SCF-HACG technique on a fully three-dimensional prototypal model [Lennard-Jones (12,6) crystal] yield thermomechanical properties (e.g., local stress) in good agreement with "exact" properties computed in the fully atomistic limit. The SCF-HACG method is also successfully used to characterize the grain boundary in a Lennard-Jones bicrystal.

Original languageEnglish (US)
Article number064705
JournalJournal of Chemical Physics
Volume125
Issue number6
DOIs
StatePublished - Aug 22 2006

Fingerprint

Bicrystals
Potential energy
self consistent fields
Grain boundaries
Thermodynamics
ghosts
Atoms
Crystals
bicrystals
three dimensional models
mesh
grain boundaries
potential energy
methodology
thermodynamics
crystals
atoms

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Hybrid atomistic-coarse-grained treatment of multiscale processes in heterogeneous materials : A self-consistent-field approach. / Diestler, D. J.; Zhou, H.; Feng, R.; Zeng, Xiao C.

In: Journal of Chemical Physics, Vol. 125, No. 6, 064705, 22.08.2006.

Research output: Contribution to journalArticle

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