Effect of structural parameters on mechanical properties of Pyramidal Kagome lattice material under impact loading

The present study aimed at understanding the influences of structural parameters on the mechanical properties of Pyramidal Kagome (PK) lattice material under impact loading. Seven different PK structures varying height-width ratio and rod diameter were manufactured by selective laser melting (SLM). In this study, both experiments and simulation were conducted to understand the influences of rod diameter, height-width ratio, number of unites and layers on the mechanical properties of PK lattice material. The failure characteristics and the deformation process were recorded by using the digital photography technique. All the specimens were observed to have a clear rupture along 45°in the quasi-static test, while broke along the direction of the vertical panel in the SHPB test with a strain rate of about 2000s⁻¹.The results showed that the initial deformation zone of the PK switched from the intermediate layer to the lower and upper layer with the increase of rod diameter. Moreover, the strength, modulus and energy absorption capacity of the PK were proportional to the square of its relative density. As the height-width ratio increases, the modulus of the PK gradually increased. In addition, increasing the number of lateral units and reducing the number of layers contributed to the improvement on the mechanical properties of the PK.