Hybrid layered octahedron-based lattice structures, deformation pattern and mechanical properties

• Three unit cells based on the octahedron were designed. • Twelve structures, including uniform and hybrid layered configurations, were analyzed for deformation and mechanical properties. • A comprehensive comparison was conducted between simulation results and experimental tests. • One of the uniform structures, influenced by the presence of vertical struts, exhibited the highest specific energy absorption among the twelve analyzed structures. • Some hybrid layered structures exhibited higher load-bearing capacity than uniform structures with the same relative density. Strut-based lattice structures exhibit exceptional performance in load-bearing and energy absorption. With the advancements and improvements in additive manufacturing methods, the utilization of these structures has become more attractive and practical. This study aims to investigate the deformation modes and mechanical properties of hybrid layered lattice structures based on the octahedron unit cell. Twelve different structures, including uniform and hybrid layered configurations of the three unit cells, are fabricated using the Masked Stereolithography method. The behavior of each of the twelve structures under quasi-static compressive loading are experimentally examined. The results demonstrate the significant impact of hybrid layered design on the mechanical properties of these lattice structures. Furthermore, among all the structures studied, the inclusion of a strut oriented parallel to the compressive loading direction showed the highest energy absorption performance. Additionally, the findings of this research can be important and inspiring for the fabrication and design of lattice structures at various scales.