Extracting continuum-like deformation and stress from molecular dynamics simulations

Lili Zhang, John Jasa, George Gazonas, Antoine Jérusalem, Mehrdad Negahban

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We present methods that use results from molecular dynamics (MD) simulations to construct continuum parameters, such as deformation gradient and Cauchy stress, from all or any part of an MD system. These parameters are based on the idea of minimizing the difference between MD measures for deformation and traction and their continuum counterparts. The procedures should be applicable to non-equilibrium and inhomogeneous systems, and to any part of a system, such as a polymer chain. The resulting procedures provide methods to obtain first and higher order deformation gradients associated with any subset of the MD system, and associated expressions for the Cauchy and nominal stresses. As these procedures are independent of the type of interactions, they can be used to study any MD simulation in a manner consistent with continuum mechanics and to extract information exploitable at the continuum scale to help construct continuum-level constitutive models.

Original languageEnglish (US)
Pages (from-to)1010-1031
Number of pages22
JournalComputer Methods in Applied Mechanics and Engineering
Volume283
DOIs
StatePublished - Jan 1 2015

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Keywords

  • Deformation
  • Deformation gradients
  • Minimization
  • Molecular dynamics
  • Multi-scale
  • Stress

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Computer Science Applications

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