Propiedades anisotrópicas dependientes de la velocidad de deformación en componentes poliméricos obtenidos mediante fabricación aditiva

Abstract

Rapid prototyping using the Material Extrusion Additive Manufacturing (ME-AM) technique, also known as fused filament fabrication or fused deposition modelling, is a manufacturing process that has gained increasing interest in both industry and in academic communities. Components with complex geometries and good mechanical properties can be obtained using ME-AM, if the appropriate processing parameters are selected. Additive manufacturing techniques are increasingly being used for a wide variety of fields and components, including engineering components. Knowing how the process influences the mechanical properties is essential to be able to design products properly and safely. The MEAM process is inherently heterogeneous. Depending on the selected processing parameters, locally different cooling profiles are generated and more or less orientation of the polymer chains is introduced. This leads to anisotropic mechanical properties. In this study, the viscoelastic mechanical properties, dependent on the deformation rate, of polylactic acid (PLA) and acrylonitrile butadiene-styrene (ABS) tensile specimens manufactured using ME-AM are quantified and compared. The experimental results of the tensile specimens obtained with different ME-AM processing parameters have been analyzed using the Ree-Eyring flow model (modification of the Eyring model). ABS material has shown a thermoreologically simple behavior, while PLA has shown a thermoreologically complex behavior. Furthermore, results suggest that PLA processed with ME-AM shows a strain-dependent Eyring rate constant, while ABS exhibits a strain-dependent activation volume.