Effect Of Structure Design Research Articles

Lightweight design of lattice structure of boron steel prepared by selective laser melting

Three-cycle minimum surface structures show excellent lightweight and energy absorption capabilities, and additive manufacturing techniques provide a unique degree of freedom for lattice structure design. Therefore, in this study, three-period minimum surface (TPMS) structures of Schwarz-P boron steel alloys were prepared by Selective Laser Melting (SLM) technique. By investigating the effect of lattice structure design, we have analyzed the deformation behavior, mechanical properties and energy absorption capacity under compression. In addition, tensile properties and fracture morphology were analyzed to gain insight into the performance characteristics of these structures, and the effect of structural design on hardness was explored. The results of the study show that the structural design has a small effect on the microstructure and hardness. Under compressive loading, the P (0.5 1) structure exhibits a uniform deformation behavior, while the other four structures show a crushing deformation pattern. In particular, the P (0.5 1) structure exhibits excellent compressive performance, with an energy absorption work per unit mass as high as 296.2 J/mm^3, and its stiffness reaches 1627 MPa. Meanwhile, the P (0.35 1) structure exhibits excellent tensile performance with the tensile strength of 687 MPa. The morphological analysis of the tensile fracture reveals that the fracture mainly occurs in the strut nodes, and it mainly exhibits ductile tensile fracture.

Effect of structure design on compressive properties and energy absorption behavior of ordered porous aluminum prepared by rapid casting

In this study, ordered porous aluminum specimens with four different cubic structures, i.e. basic truss structure, high density truss structure, strengthened truss structure and graded truss structure, were fabricated by rapid casting combining the selective laser sintering and the infiltration casting. Pure aluminum and ZL111 alloy were selected as matrix materials of ordered porous aluminum. Compressive properties and energy absorption behavior were investigated by quasi-static compression tests. The results showed that high density truss structure and strengthened truss structure exhibited higher compressive properties, resulting from short struts and strengthened joints. The energy absorption behavior of these structures showed similar tendency to their compressive properties. Strengthened truss structure and graded truss structure were capable of exhibiting higher specific compressive properties. Structure design to transform the deformation mechanism was effective for improving compressive properties and energy absorption behavior. Moreover, the results demonstrated that deformation processes depended on the comprehensive effect of ordered porous structures and matrix materials, indicating that the stretching-dominated mechanism combined with high strength matrix was conducive to higher compressive strength. Based on structure design in this study, ordered porous aluminum prepared by rapid casting showed more superior compressive properties and energy absorption behavior than other existed preparation methods.