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Journal Article

eXtended variational quasicontinuum methodology for lattice networks with damage and crack propagation

Rokoš O., Peerlings R. H. J., Zeman Jan

: Computer Methods in Applied Mechanics and Engineering vol.320, 1 (2017), p. 769-792

: GF16-34894L, GA ČR

: Lattice networks, Quasicontinuum method, Damage, Extended finite element method, Multiscale modelling, Variational formulation

: 10.1016/j.cma.2017.03.042


(eng): Lattice networks with dissipative interactions are often employed to analyse materials with discrete micro- or meso-structures, or for a description of heterogeneous materials which can be modelled discretely. They are, however, computationally prohibitive for engineering-scale applications. The (variational) QuasiContinuum (QC) method is a concurrent multiscale approach that reduces their computational cost by fully resolving the (dissipative) lattice network in small regions of interest while coarsening elsewhere. When applied to damageable lattices, moving crack tips can be captured by adaptive mesh refinement schemes, whereas fully -resolved trails in crack wakes can be removed by mesh coarsening. In order to address crack propagation efficiently and accurately, we develop in this contribution the necessary generalizations of the variational QC methodology.

: JJ

: 20501