Abstract
In the present work the temperature profile variations generated in rectangular specimens built using the Fused Deposition Modeling (FDM) process, at different printing speeds and orientations, were investigated. The temperature recordings were achieved by the integration of temperature sensors throughout the 1st and/or 21st building layer of the specimens. The experimental results show that the temperature values inside the specimen re-main above the glass transition temperature (Tg) even at the end of the fabrication process. Higher values were obtained when increasing the printing speed and decreasing the printing path. The experimental results were compared to the corresponding ones derived by simulation of the thermal diffusion problem via Finite Element Analysis. The calculated maximum temperature values were in good agreement with the experimentally recorded ones.
Highlights
Additive manufacturing (AM) or layer manufacturing (LM) have developed intensively over the last decades, providing the potentiality to build simple or more complex 3D objects of varying material types and forms
Filament of the thermoplastic material is fed into a heated extrusion tip, where it liquefies above its glass transition temperature (Tg), and
Those that follow, the curves represent the real-time monitoring temperature variations that take place during the fabrication process, while their peaks correspond to the time that the printer's nozzle passes over the integrated thermocouple
Summary
Additive manufacturing (AM) or layer manufacturing (LM) have developed intensively over the last decades, providing the potentiality to build simple or more complex 3D objects of varying material types and forms. As defined by the ASTM:F2792-12a (2012) standard, additive manufacture is the “process of joining materials to make objects from 3D model data, usually layer upon layer, as opposed to subtractive manufacturing methodologies, such as traditional machining”. Fused Deposition Modeling (FDM) is one of the several existing technologies included in the category of the AM techniques. As described in previous works [2,3,4,5], the FDM method deposits rasters of molten thermoplastic polymers, such as Acrylonitrile Butadiene Styrene (ABS) or Polylactic Acid (PLA), that solidify into the final desired shape. Filament of the thermoplastic material is fed into a heated extrusion tip, where it liquefies above its glass transition temperature (Tg), and
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