Metallic lattice; Body Centered Cubic (BCC); Generalized quasicontinuum; 3D co-rotational beam; Plastic hinge
Abstract :
[en] We propose a generalized quasicontinuum method to model the mechanical response of 3D lattice structures. The method relies on the spatial coupling of fully-resolved domains and coarse-grained domains. In the fully-resolved domain, the full micro-structure is taken into account. In the coarse-grained domain, the kinematics of the micro-structure are individually interpolated based on their connectivity. On top of that, the contributions of the microstructure to the governing equations
in the coarse-grained domain are sampled using only a few unit cells. In both domains, geometrical and material variability along the strut can be naturally taken into account using a 3D co-rotational beam finite element with embedded plastic hinges. We verify the approach for BCC lattices, demonstrating that the new method can capture both material and geometrical non-linearities of single struts at a fraction of the cost of a direct numerical simulation.
Disciplines :
Civil engineering
Author, co-author :
CHEN, Li ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
BEEX, Lars ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Berke, Peter; Université Libre de Bruxelles - ULB > Ecole polytechnique de Bruxelles > BATir
Massart, Thierry
BORDAS, Stéphane ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
External co-authors :
yes
Language :
English
Title :
Generalized quasicontinuum modeling of metallic lattices with geometrical and material nonlinearity and variability
Publication date :
01 July 2020
Journal title :
Computer Methods in Applied Mechanics and Engineering
FNR11019432 - Multiscale Modelling Of Lightweight Metallic Materials Accounting For Variability Of Geometrical And Material Properties, 2015 (01/10/2016-30/09/2021) - Stéphane Bordas
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