Fracture behavior of octet architected nano-lattice structures under 3-point bending

Lattice structures are fabricated in creating lightweight, strong, and damage-tolerant engineering materials. Here, the CuZr metallic glass nano-lattices are made up of nanoscale hollow-tubes crisscrossed and are one of the strongest and lightest substances ever made. In this work, the flexural strength and bending stiffness of the nano-lattice structures with Octet unit cells are investigated by using numerical simulations for 3 point bending test. Curves of Force-Deflection related to 3 different cross section shapes of hollow tube, 3 different tube thicknesses and 3 different tube aspect ratios are plotted, respectively. Based on finite element simulations for these nano-lattice structures under 3-point bending, three different failure modes are observed. The conclusions from simulation results could provide the guideline for the optimization design of the nano-lattice structures.