Mechanical Properties and Deformation Behaviors of Layered‐Hybrid Lattice Structure Fabricated by Selective Laser Melting

Abstract

Three types of layered‐hybrid lattice structures (LHLSs) with different layer thickness composed of body‐centered cubic (BCC) and face‐centered cubic (FCC) unit cells were designed and manufactured by selective laser melting using Ti‐6Al‐4V powder. The microstructure and surface morphologies of the three types of the SLM‐formed LHLSs were examined by optical microscope and scanning electron microscope, respectively. Quasi‐static compression experiments were carried out to investigate the mechanical properties. The results showed that the layer thickness had a significant effect on the mechanical properties and deformation behaviors. The elastic modulus, yield strength and ultimate compressive strength of LHLS increased with the increasing of BCC and FCC layer thickness, respectively. Based on the observations of deformation process, a 45° shear band and axial fracture were observed in LHLS‐8; and step‐like deformation bands were observed in both LHLS‐4 and LHLS‐2 samples. Besides, the influence of different loading directions on mechanical properties was also investigated, it was found that the ultimate compressive strength loaded in the transverse direction was independent of the layer thickness in LHLSs.This article is protected by copyright. All rights reserved.

Mechanical Properties of Selective Laser Melting‐Processed Multihierarchical Lattice Structure Based on Body‐Centered‐Cubic Unit Cell

“…Lattice structures have found widespread applications in various fields such as automobiles, [ 1 ] aeronautics, and astronautics [ 2 ] due to their lightweight, [ 3 ] excellent energy absorption capability [ 4 ] and mechanical properties, [ 5 ] as well as flexible designability. [ 6 ] The lattice structure consists of a periodic arrangement of unit cells, which are composed of struts (equivalent to atomic bonds) and nodes (equivalent to atoms).…”