Effect of infill pattern and lattice structure on the mechanical properties of 3D-printed metal polylactide filament

The present work aimed to systematically investigate the effects of infill patterns on the deformation and failure behaviors of metal-based polylactide structures, fabricated by the fused deposition modeling (FDM) process. The effects of infill patterns on the mechanical properties and relative energy absorption of the composite structures were analyzed.

The recent growth of desktop three-dimensional (3D) printing has led to a new way of building objects. It has been widely publicized that in tension the road-to-road and layer-to-layer adhesion, shrinkage of the roads, and higher porosity in some orientations influence the material properties of the printed parts and cause anisotropy. . In the manufacture of pieces using 3D printing, it is very common to use a range of infill patterns and structure with the aim of reducing printing time and material consumption. However, it is not well understood how these factors influence the characteristics of the pieces obtained. The infill pattern was one of the deterministic factors for the deformation and failure modes, mainly due to the defects caused by the printing path. Due to the differences with Fused Deposition Modelling (FDM) technology, it is necessary to evaluate the strength of the pieces manufactured with this technology. In this work, the influence of two controllable variables, such as the pattern and structure of the infill on the mechanical properties of metal polylactide filament is studied using a 3D printer. The infill pattern was one of the deterministic factors for the deformation and failure modes, mainly due to the defects caused by the printing path.

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