Multiscale modeling of the dynamics of solids at finite temperature

Xiantao Li, Weinan E

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

We develop a general multiscale method for coupling atomistic and continuum simulations using the framework of the heterogeneous multiscale method (HMM). Both the atomistic and the continuum models are formulated in the form of conservation laws of mass, momentum and energy. A macroscale solver, here the finite volume scheme, is used everywhere on a macrogrid; whenever necessary the macroscale fluxes are computed using the microscale model, which is in turn constrained by the local macrostate of the system, e.g. the deformation gradient tensor, the mean velocity and the local temperature. We discuss how these constraints can be imposed in the form of boundary conditions. When isolated defects are present, we develop an additional strategy for defect tracking. This method naturally decouples the atomistic time scales from the continuum time scale. Applications to shock propagation, thermal expansion, phase boundary and twin boundary dynamics are presented.

Original languageEnglish (US)
Pages (from-to)1650-1685
Number of pages36
JournalJournal of the Mechanics and Physics of Solids
Volume53
Issue number7
DOIs
StatePublished - Jul 1 2005

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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