Resilience and dissipation in architected microstructures in large deformation

Abstract

In this paper, we investigated the mechanical behavior of architected microstructures on cubic crystal lattices under large deformation and cyclic loading condition. Interpenetrating morphologies were presented as a counter part of dispersed morphologies. We investigated the effect of co-continuity on the mechanical performance at large strain. Representative volume elements in the principal crystallographic directions were presented to evaluate the anisotropy of the architected microstructures at large strain. The mechanical behavior of each constituent material under large deformation has been characterized. Then, a non-linear constitutive model for each constituent material was suggested and applied to a boundary value problem for the architected microstructures under finite deformation. Representative architected microstructures were fabricated on a high-resolution 3D printer, and compression tests were conducted using a mechanical testing machine. In experimental data and numerical simulation results, we elucidated the effect of co-continuity on stiffness, energy dissipation, shape recovery, and anisotropy of architected microstructures at large strain. Further, we presented architected microstructures that exhibit no reduction in stress response during cyclic loading at extreme stains.