Effect of topological configuration on mechanical properties for 3D printed porous structures

In this work, we provide a novel BCC porous structure to explore the effect of topological configuration on mechanical properties through computer-aided design. This novel porous structure is based on BCC topological configuration and obtained by shifting the central node of the standard tetragonal configuration up and down. Furthermore, the SLM (selective laser melting, SLM) technology is used to manufacture the samples, and the mechanical properties of the designed porous structure are tested by means of simulation analysis and experiment. The results show that the provided porous structure has a high equivalent elastic modulus and a curve relationship between a higher stress plateau. Furthermore, compared with the TrBCC (traditional BCC, TrBCC) structure, the equivalent modulus of the CDBCC (Center Down BCC, CDBCC) structure under 5%, 10% and 15% volume fraction were 44.35%, 63.40% and 66.08% higher than that of the TrBCC structure. Meanwhile, the energy absorption characteristics of the CDBCC structure with 5%, 10% and 15% volume fraction increased by 31.57%, 72.42% and 27.23%, respectively. It is found that the porous configuration with the designed junction offset has better energy absorption characteristics, which provides more options for the lightweight application of porous structures with high specific stiffness and high energy absorption characteristics.