Mechanical Properties and Energy Absorption Abilities of Diamond TPMS Cylindrical Structures Fabricated by Selective Laser Melting with 316L Stainless Steel

Abstract

Triply periodic minimal surfaces (TPMS) are structures inspired by nature with unique properties. Numerous studies confirm the possibility of using TPMS structures for heat dissipation, mass transport, and biomedical and energy absorption applications. In this study, the compressive behavior, overall deformation mode, mechanical properties, and energy absorption ability of Diamond TPMS cylindrical structures produced by selective laser melting of 316L stainless steel powder were investigated. Based on the experimental studies, it was found that tested structures exhibited different cell strut deformation mechanisms (bending-dominated and stretch-dominated) and overall deformation modes (uniform and “layer-by-layer”) depending on structural parameters. Consequently, the structural parameters had an impact on the mechanical properties and the energy absorption ability. The evaluation of basic absorption parameters shows the advantage of bending-dominated Diamond TPMS cylindrical structures in comparison with stretch-dominated Diamond TPMS cylindrical structures. However, their elastic modulus and yield strength were lower. Comparative analysis with the author’s previous work showed a slight advantage for bending-dominated Diamond TPMS cylindrical structures in comparison with Gyroid TPMS cylindrical structures. The results of this research can be used to design and manufacture more efficient, lightweight components for energy absorption applications in the fields of healthcare, transportation, and aerospace.

Study on the Energy Absorption Performance of Triply Periodic Minimal Surface (TPMS) Structures at Different Load-Bearing Angles

“…Inspired by nature, TPMS structures have been discovered, and their advantage lies in the fact that the curvature in all three orthogonal directions is zero [ 1 , 2 , 3 ]. Compared to lattice structures such as octet, cubic, body-centered cubic (BCC), or face-centered cubic (FCC), the advantage of reducing the stress concentration effects are exhibited in TPMS structures, which can enhance their mechanical performance, such as energy absorption capacity [ 4 , 5 , 6 , 7 ]. In the field of energy absorption in engineering practice, TPMS structures have many application examples and prospects, for example, in vehicle bumpers, sports protective gear, architectural structures, industrial equipment, sports shoe insoles, and so on [ 8 ].…”

On the Development of Twinning-Induced Plasticity in Additively Manufactured 316l Stainless Steel

“…This study focusses on 316L stainless steel, which has widespread commercial use, is known to have PBF-LB manufacturability, and has desirable characteristics including high strength, ductility and strainhardening behaviour thanks to twinning induced plasticity (TWIP) [5,6]. PBF-LB 316L has attracted interest for use in crash protection applications [7][8][9], where the TWIP extends the plastic deformation and therefore increases energy absorption before failure.…”

Turbulent Flow Heat Transfer and Thermal Stress Improvement of Gas Turbine Blade Trailing Edge Cooling with Diamond-Type TPMS Structure

“…Therefore, in this research, the thermo-fluid-solid coupling investigation is executed on the heat transfer and thermal stress of the trailing edge channel with the optimal TPMS-based structure (Diamond topology). The Diamond-TPMS structure is selected in this investigation because it shows uniform flow and heat transfer distributions, even though the mechanical behaviors are similar to other TPMS networks, as found in many previous studies [23][24][25]. The material and boundary conditions are set based on the nearly actual gas turbine operating conditions.…”