Quasi-static and fatigue properties of additively manufactured AlSi10Mg lattice of various scales

摘要: Additive Manufacturing (AM) has demonstrated significant advancements in fabricating metallic components recently since it has gained popularity due to the invention in the 1980s. It has been providing new possibilities in industries with complex geometries such as lattice structures, which are considered excellent candidates for numerous applications from relatively small to large scales such as biomedical implantations, energy absorption, and heat dissipation. According to recent literature studies, the mechanical properties of components fabricated AM technique are highly dependent on the thickness and scales of the parts. For metallic structures, the importance of the thickness and scale effect on lattice structures has not been fully investigated yet. Therefore, this research aims to evaluate the wall thickness and scale effect on the mechanical properties of uniform sheet-based gyroid lattice structures under quasi-static compression and cyclic loading conditions. First, specimens were designed and divided into three categories with the dimensional constraints of keeping the constant porosity, wall thickness, and cubic size in each category. Then all the lattice structures were fabricated via selective laser melting (SLM) technique with the material of AlSi10Mg powder. All the manufactured specimens are subjected to quasi-static and cyclic compressive loading conditions to evaluate the mechanical strength and fatigue properties. The experimental results from the compression tests were compared under each category and further investigated with scanning electron microscope (SEM) to observe the fracture locations in a more detailed manner …