Analysis of the deformation mechanism and mechanical properties of graded body-centered cubic nested body-centered cubic lattice material

Lattice metamaterials are lightweight, multifunctional periodic porous materials with many advantages compared to traditional materials, such as high specific strength/stiffness and high blast and impact resistance. Therefore, they have been widely used in various fields and have received extensive attention from researchers. Compared with the conventional body-centered cubic (BCC) lattice material, the new graded body-centered cubic nested body-centered cubic (GBCC-BCC) lattice material has superior specific mechanical properties (specific energy absorption, specific strength, and specific stiffness). GBCC-BCC lattice materials with different relative densities were prepared using 3D printing technology. A combination of experimental and numerical simulations was used to investigate the mechanical properties of the GBCC-BCC lattice material, including size effects, deformation patterns, tension and compression asymmetry, and specific mechanical properties at different relative densities. Experimental data and numerical simulations show that the specific energy absorption, strength, and stiffness of the GBCC-BCC lattice in the Z-direction are better than those of most lattice materials with basic configurations and topological combination configurations when the relative density is greater than 0.3.