Abstract
In the last few years, Fused Filament Fabrication is growing in the industrial field for the manufacture of final products by using new materials with high mechanical performances. Among those, one of the strongest is Carbon-PA. This is a composite material made by Nylon thermoplastic matrix filled with short carbon fibers reinforces. The aim of this work is to investigate its mechanical properties in static and dynamic conditions. Cylindrical specimens were produced by extruding the material in the three main printing directions. Then, uniaxial quasi-static and dynamic compression tests have been performed to evaluate its strain rate sensitivity. Dynamic tests have been carried out through a direct Split Hopkinson Bar setup with a pulse-shaping technique. The results show a compression behaviour dependent on the printing direction and strain rate. The behaviour of Carbon-PA was different between static and dynamic condition, passing from ductile to brittle. Moreover, a tomography analysis was carried out on the samples to evaluate the voids distribution.Graphic abstract
Highlights
According to ISO/ASTM 52900 standard, the Material Extrusion (ME) is one of the numerous additive manufacturing (AM) processes, in which material is selectively dispensed through a nozzle or orifice
Material Extrusion technology for polymers is known as Fused Filament Fabrication (FFF), known under the trademarked term Fused Deposition Modeling (FDM), and is one of the most popular processes for prototyping applications [1]
This study focuses on the mechanical characterization of a Carbon-PA composite, fabricated by Fused Filament Fabrication, subjected to quasi-static and high strain rate compression loading
Summary
According to ISO/ASTM 52900 standard, the Material Extrusion (ME) is one of the numerous additive manufacturing (AM) processes, in which material is selectively dispensed through a nozzle or orifice. Material Extrusion technology for polymers is known as Fused Filament Fabrication (FFF), known under the trademarked term Fused Deposition Modeling (FDM), and is one of the most popular processes for prototyping applications [1]. Fused Deposition Modeling consists of printing a continuous filament of a thermoplastic material, according to a filling pattern, or strategy, to obtain the desired shape. The molten material is forced out of the extruder’s nozzle and is deposited over the printing platform. Once the first layer is completed, the second layer can be directly deposited onto the growing work-piece until the object’s fabrication is complete
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