Higher-order quasicontinuum methods for elastic and dissipative lattice models: Uniaxial deformation and pure bending

L. A A Beex, O. Rokoš, J. Zeman, S. P A Bordas

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The quasicontinuum (QC) method is a numerical strategy to reduce the computational cost of direct lattice computations - in this study we achieve a speed up of a factor of 40. It has successfully been applied to (conservative) atomistic lattices in the past, but using a virtualpower statement it was recently shown that QC approaches can also be used for spring and beam lattice models that include dissipation. Recent results have shown that QC approaches for planar beam lattices experiencing in-plane and out-of-plane deformation require higherorder interpolation. Higher-order QC frameworks are scarce nevertheless. In this contribution, the possibilities of a second-order and third-order QC framework are investigated for an elastoplastic spring lattice. The higher-order QC frameworks are compared to the results of the direct lattice computations and to those of a linear QC scheme. Examples are chosen so that both a macroscale and a microscale quantity influences the results. The two multiscale examples focused on are (i) macroscopically prescribed uniaxial deformation and (ii) macroscopically prescribed pure bending. Furthermore, the examples include an individual inclusion in a large lattice and hence, are concurrent in nature.

Original languageEnglish
Pages (from-to)344-368
Number of pages25
JournalGAMM Mitteilungen
Volume38
Issue number2
DOIs
Publication statusPublished - 9 Sep 2015
Externally publishedYes

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