Characterization of penetrate and interpenetrate tessellated cellular lattice structures for energy absorption

Recently, cellular lattice structures are gaining research attention due to their lightweight and high energy absorption. Interpenetrated lattice structure is a combination of two or more regular lattices with the same volume and without any contact at the unit level. The interpenetrated tessellated lattice (I-PTL) structures are better known for load sharing and energy absorption applications. In the current research, regular unit cell lattices such as cubic, beam lattice, body-centered cubic, and octahedron are considered to fabricate penetrated and interpenetrated cellular lattice structures and tested for energy absorption on quasi-static loading. These structures were fabricated using a Vat polymerization three-dimensional printer and tested as per the American Society for Testing and Materials (ASTM) standards, and the results were compared with numerical simulation using ANSYS. The penetrated tessellated lattice structural and I-PTL behavior deliver energy transfer controlled by the surface and solid joint interactions. The enhancement in mechanical properties is observed with the controllable compliance and specific energy absorption of the lattice structure.