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Anisotropic elastic-plastic behavior of architected pyramidal lattice materials
, Article Acta Materialia ; Volume 183 , 2020 , Pages 118-136 ; Arghavani, J ; Akbarzadeh, A. H ; Naghdabadi, R ; Sharif University of Technology
Acta Materialia Inc
2020
Abstract
The initial and subsequent yield surfaces for architected pyramidal lattice materials are investigated analytically. Considering lattice struts as elastic-perfectly plastic thin beams subjected to both axial force and bending moment, a set of nonlinear elastic-plastic constitutive relations for a strut is proposed. Moreover, we phenomenologically present anisotropic pressure-dependent yield functions for pyramidal lattices. Comparison of planar yield surfaces of pyramidal lattices predicted by analytical approach to the ones obtained from phenomenological models shows a good agreement for the type of external loads and range of strains investigated in this study. Investigating the normality...