Mechanical Properties and Deformation Behaviour of ARCH and BCT Lattice Structures Manufactured by Selective Laser Melting

Abstract

In this study, a new lattice structure ARCH is proposed, ARCH lattice structure and traditional lattice structures BCT were fabricated from 316 L stainless steel by SLM. Mechanical properties and deformation behavior of the lattice structures were experimentally investigated. The results show that the ARCH lattice structures have better mechanical property and energy absorption capability than BCT lattice structures. Under the same relative density, the compressive strength and elastic modulus of the ARCH lattice structure is 121.27% and 60.48% higher than the BCT lattice structure, and the ARCH lattice structures have better energy absorption properties than the BCT lattice structures.

Study on the impact behavior of arch micro-strut (ARCH) lattice structure by selective laser melting (SLM)

“…When the straight micro-strut lattice structure is impacted, severe buckling instability occurs immediately after small deformation, and the rate sensitivity brought by its topology is greater than that of ARCH lattice structure. In general, arch structure has more stable performance under pressure (Timoshenko, 1961), so it has higher plateau stress and better energy absorption performance under quasi-static compression than straight micro-strut lattice structure under the same relative density (DING et al , 2020), and the inertia effect can be weakened because of large elastic and plastic deformation under high-speed impact. Therefore, the rate sensitivity brought by the topology is slightly lower than that of straight micro-strut lattice structure, but it is bound to be more stable in the process of micro-strut deformation, buckling instability and collapse, which can play a buffer role against large impact force, and the rate sensitivity brought by the buckling of arch micro-struts mainly occurs when the strain is large enough.…”

“…The bulk density of the powder is 4.3 g/cm 3 , the fluidity is 16.29 s/50 g, the degree of sphericity is 0.884 and the particle size distribution is 10–45 μm. According to the previous experience (DING et al , 2020), considering the requirements of density, hardness, grain size and surface roughness, the manufacturing parameters are as follows: the laser power is 285 W, the scanning speed is 900 mm/s, the scanning distance is 0.1 mm and the spot compensation radius is 0.1 mm.…”

“…In our early work, the energy absorption performance of ARCH lattice structure and body-centered tetragonal (BCT, similar to BCC) lattice structure during quasi-static compression were studied. The specific energy absorption and energy absorption efficiency were obtained by calculating the experiment data, as shown in Figure 3; the ARCH lattice structures have better energy absorption properties than the BCT lattice structures (DING et al , 2020) and have excellent flexural resistance (Ding et al , 2021).…”

Compression Behavior of 3D Printed Polymer TPU Cubic Lattice Structure

“…Additionally, the new cell exhibited higher load-bearing capacity and stiffness in comparison with the BCC cell of higher relative density. Ding et al 17 proposed a new lattice structure ARCH, and experimentally studied that the ARCH lattice structure has better mechanical properties and energy absorption capabilities than the traditional lattice structure. In addition, some excellent properties of biomimetic structures are also used in the optimal design of lattice structures.…”

Flexural Properties of ARCH Lattice Structures Manufactured by Selective Laser Melting

“…Compared with the lattice structures with straight struts, the ARCH lattice structure has excellent compression properties. [ 16,17 ] However, the bending property of the ARCH lattice structure is yet to be discovered, as it is an important index of the material used in the secondary load‐bearing components. In this study, the flexural properties of ARCH lattice structures fabricated by SLM under different loading directions and with different relative densities are simulated and experimentally researched.…”