Investigations of raster layup effect on mechanical and fracture properties of material extruded ABS samples under biaxial loadings

The mechanical properties of 3D printed parts are influenced by the parameters used during the manufacturing process. Among them, the raster orientation plays an important role. In this study, biaxial tensile tests coupled with digital image correlation are used to evaluate the effect of raster orientation on the deformation and failure mechanisms of acrylonitrile butadiene styrene samples. It is shown that the local deformation mechanisms are mainly driven by the raster orientation after the crack initiation at sample corners. The kinematic fields evidence that the local deformation mechanisms are related to the mesostructures induced by the fabrication process. A comparative analysis of the different printing orientations (0°/90°, ±45°, 15°/105°, and 30°/120°) reveals that the orthotropic architecture strongly influences the mechanical response and failure mechanisms. This study points out the necessity of improving the filament junctions of polymer parts obtained by fused filament fabrication.