Abstract
In the Fused Filament Fabrication (FFF) process, the part is built as a layer-by-layer deposition of a feedstock filament material. The continuous improvements of the FFF have changed the main purpose of this technique from rapid prototyping to a rapid manufacturing method. Then, it is fundamental to determine the material properties of FFF parts as a function of the service load. The impact loads and, in particular, a high strain rates tensile impact can be a critical issue in FFF part and, in general, for plastic materials. The aim of the present work is to characterise the mechanical behaviour of FFF parts under tensile impact loads. To this purpose, three different orientations (i.e., 0°, 45° and 90°) both single- and multilayer specimens, have been printed. Finally, the influence of the impact speed on the mechanical behaviour has also been tested under three different values of speed (3.78 m/s, 3.02 m/s and 2.67 m/s). The results show that the FFF parts are influenced by the raster orientation, confirming the orthotropic behaviour also under dynamic loads, while the variation of impact speed, on peak force and absorbed energy, is limited.
Highlights
One of the most employed 3D printing techniques, in both consumer and enterprise environments, is the Fused Filament Fabrication (FFF)
As in other applications of 3D printing technologies [4], in this process the part is built as a layer-by-layer deposition of a feedstock filament material
The aim of the present work is to characterise the mechanical behaviour of FFF parts under tensile impact loads
Summary
One of the most employed 3D printing techniques, in both consumer and enterprise environments, is the Fused Filament Fabrication (FFF). This process, developed by Stratasys Inc. in the early 1990s with the commercial naming of Fused Deposition Modelling (FDM), has been employed in many fields such as aerospace, medical, construction and cultural [1,2]. As in other applications of 3D printing technologies [4], in this process the part is built as a layer-by-layer deposition of a feedstock filament material. The raw material is partially melted, extruded and deposited onto the previously built model by a numerically controlled heated nozzle [1] (Figure 1a)
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