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Characterization of Die-swell in Thermoplastic Material Extrusion by Austin R. Colon; David O. Kazmer; Amy M. Peterson; Jonathan E. Seppala is a Engineering article available to read on EtoBox.

What is Characterization of Die-swell in Thermoplastic Material Extrusion about?

Die-swell is a flow effect that occurs in polymer extrusion whereby the material experiences rapid stress and dimensional changes upon exiting the nozzle orifice. Material extrusion additive manufacturing is no exception, and this effect influences the final dimensions of the printed road and imparts residual stresses. Die-swell is measured via a custom test cell that uses optical and infrared cameras and an instrumented hot end with an infeed pressure load cell. The instrumented hot end is mounted onto a stationary extruder above a conveyor to simulate printhead translation at steady state conditions for a wide range of volumetric flow rates. Investigated factors for an acrylonitrile butadiene styrene (ABS) filament include volumetric flow rate (0.9 mm 3 /s to 10.0 mm 3 /s), hot end temperature setpoint (200-250 • C), and nozzle orifice diameter (0.25-0.60 mm). The die-swell increases as a function of the volumetric flow rate and shear stress but decreases as a function of the hot end temperature setpoint and nozzle orifice diameter. For modelling, an implementation of the Tanner model for dieswell displays good agreement with experimental results. The model also demonstrates that

Who reads Characterization of Die-swell in Thermoplastic Material Extrusion?

Author

Austin R. Colon; David O. Kazmer; Amy M. Peterson; Jonathan E. Seppala

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)