Effect of filling pattern on the response of 316L additively manufactured architected structures subjected to dynamic indentation

Abstract

The out-of-plane compressive behaviour of three types of architected structures subjected to quasi-static and dynamic indentation was investigated in this paper. The effects of filling a pattern - with three unit-cell patterns and three levels of cell wall waviness - and velocities are characterized through experiments at low (10 mm/min) and high-speed testing (around 300 m/s). The metallic architected structures of interest are extruded in two-dimensions through Directed Energy Deposition – Laser Powder (DED-LP) technology. This work is focused on the energy absorption capacities of architected structures when indented. In quasi-static, the results showed no effect of the cell walls waviness on the energy absorption capacity of the structures. However, different deformation mechanisms were observed depending on the unit-cell pattern, showing an effect of unit-cell pattern on energy absorption capacities. On the contrary, in dynamic enhanced absorption capacities were observed with higher level of cell walls waviness. Finally, the cross-sectional view of the structures after indentation were analyzed to observe the failure mechanisms.