We investigate the impact of the architecture on the global behaviour of the structure. Especially, how localization bands interact with the lattice, and the possibility of controlling initiation and propagation of localized strain with internal geometrical features. A nonlinear elastoplastic material model implemented within a full-field finite element framework [2,3] is used in order to simulate the Piobert-Lüders band formation and propagation. The model also considers a finite transformation framework with periodic boundary conditions .
Initiation and propagation of material instabilities depend on the geometry and the relative orientation of the solicitation. Propagating and non-propagating behaviours are identified for the localisation bands and related to the different geometrical archetypes considered. Material instabilities affect the mechanical behaviour of the structure as far as they are governed by the architecture. Simulation results have been compared to DIC tensile experiments conducted on laser-architectured ARMCO® pure iron samples .
This approach is then extended to superelasticity in the case of NiTi shape-memory alloy.
 Piobert G. (1842). Mémorial de l’Artillerie, 5, Expérience sur la pénétration des projectiles dans le fer forgé, 502-509. Bachelier.
 Ballarin, V., Soler, M., Perlade, A., Lemoine, X., & Forest, S. (2009). Mechanisms and modeling of bake-hardening steels: Part I. Uniaxial tension. Metallurgical and Materials Transactions A, 40(6), 1367-1374.
 Mazière, M., & Forest, S. (2015). Strain gradient plasticity modeling and finite element simulation of Lüders band formation and propagation. Continuum Mechanics and Thermodynamics, 27(1-2), 83-104.
 Dirrenberger, J., Forest, S., Jeulin, D., & Colin, C. (2011). Homogenization of periodic auxetic materials. Procedia Engineering, 10, 1847-1852.
 Viard, A. E., Dirrenberger, J., & Forest, S. (2020). Propagating material instabilities in planar architectured materials. International Journal of Solids and Structures, 202, 532-551.
21.03.2023, 14.00, Room B-366 @ Thákurova 7, 166 29 Prague 6 | MS Teams