Topological and Mechanical Properties of Different Lattice Structures Based on Additive Manufacturing

Abstract

The appearance and development of additive manufacturing technology promotes the production and manufacture of parts with more complex designs and smaller sizes and realizes the complex topology that cannot be made by equal-material manufacturing and submanufacturing. Nowadays, the application of tri-periodic minimal surface (TPMS) in topology optimization design has become a new choice, and, because of its excellent structure and properties, has gradually become mainstream. In this paper, the mechanical properties of four different topologies prepared by selective laser melting (SLM) using 316L stainless steel powder were investigated, including two TPMS sheet structures (Primitive surface, Gyroid surface) and two common lattice structures (Bcc lattice, truss lattice). The mechanical properties (Young’s modulus, yield stress, plateau stress, and toughness) were compared by numerical simulation and compression experiment. It can be concluded from the results that the mechanical properties and deformation mechanism of the specimen are mainly related to the type of lattice, though have little relationship with unit thickness at the same relative density. The Gyroid curved structure showed the best mechanical properties and energy absorption capacity, followed by the truss lattice structure. By comparison, the mechanical properties of the traditional Bcc lattice structure and the Primitive surface structure are poor, and the deformation mechanism of these two structures is uncertain and difficult to control.

Enhanced Mechanical Properties of Lattice Structures Enabled by Tailoring Oblique Truss Orientation Angle

“…[35]) and the yield stress of the proposed lattice structure with to previous studies. [ 16,21,22,36–61 ] It can be seen that the energy absorption capacity values in current work exceed those in MBCC lattices, which were also additively manufactured by 316L stainless steel powder. Additionally, our data is just slightly lower than those light‐weight lattice structures such as Ti 6 Al 4 V lattice structures.…”

“…Comparison on the a) energy absorption and b) normalized yield stress of current lattice structures with , with previously reported lattice structures. [ 16,21,22,36–61 ] …”

Mechanical characterization of lattice structure produced by additive manufacturing under torsion and compression

“…In addition, literature is presented that the torsion behavior changes according to the unit cell geometry and is independent of the strut length. 44 After the torsion tests were completed and the critical loads were calculated compression tests were performed to determine the deformation responses of the structures to the compression test. Stress states in the material at critical load were evaluated and the results were discussed.…”

Experiment Investigation of the Compression Behaviors of Nickel-Coated Hybrid Lattice Structure with Enhanced Mechanical Properties

“…In the past few decades, the development of additive manufacturing technology has promoted the extensive research on microlattice structures. Many lattice structures with excellent mechanical properties, such as body-centered cubic (BCC), octet-truss (OT), and rhombic dodecahedron (RD), have been studied and their mechanical properties were optimized, in order to be used in different engineering fields [12][13][14][15]. With the rapid development of advanced manufacturing technology, the development of engineering materials has shown obvious trends toward light weight, integration, functionalization, and biomimicry [16].…”