Quasi-static and dynamic behavior of additively manufactured metamaterial structures with layered-hybrid topologies

Abstract

A layered-hybrid metamaterial structure (LHMS) composed of a bio-inspired lattice cell and a dodecagon body-centered lattice cell is proposed, for the purpose of combining the advantages of the bending-dominated and stretching-dominated structures. For the sake of investigating the mechanical performance and deformation evolution of the LHMS, compressive experiments of the specimens fabricated by laser powder bed fusion were performed via electronic universal machine, drop hammer, and Split Hopkinson Pressure Bar system. The deformation modes of the LHMS were captured by a digital camera. The experimental observations reveal that the LHMS exhibits a stable deformation mode under a large range of loading speeds. The outcomes demonstrate that the LHMS exhibits a controllable deformation mode, which has a potential serving as safety protective components. Meanwhile, numerical simulations were carried out to disclose the deformation details. Subsequently, parametric analysis was performed on the basis of the validated finite element results, aiming to discuss the mechanical performance advantage, the effect of component ratio of each sub-cell, and the effect of loading angle on the mechanical properties of the LHMS. The results indicate that the layered-hybrid design possesses superior energy absorption ability and the specific energy absorption is 25.0% and 84.7% higher compared with each individual component with the same mass. Also, the LHMS with component ratio 1.0 possesses the highest specific energy absorption of 10.64 kJ/kg, which is 32.7% and 25.9% higher than that of the LHMS with component ratio 0.7 and 1.5, respectively.