SAMPE Journal - September/October 2019 - 8
FEATURE
Large-scale additive
Manufacturing
Large-scale Additive Manufacturing of Highly
Exothermic Reactive Polymer Systems
Stian K. Romberg1,2, Christopher J. Hershey2, John M. Lindahl2,
William Carter2,Brett G. Compton1, and Vlastimil Kunc2
1
University of Tennessee, Knoxville
Knoxville, TN
2
Manufacturing Demonstration Facility
Oak Ridge National Laboratory
Oak Ridge, TN
ABSTRACT
A
dditive manufacturing (AM) of reactive polymer systems involves the deposition of materials at
room temperature that either cure during printing through a chemically initiated reaction or require
thermal initiation after printing. This presentation focuses on large-scale AM of chemically initiated
thermosetting resins to characterize the effects of heat generation, temperature-dependent viscoelasticity,
and crosslinking on the printing process. Real-time tracking of both temperature and cure fronts during the
build process were investigated using infrared (IR) and optical vision systems in combination with selected
material dyes. Heat generation within the previously-deposited layers was observed to cause significant
reduction in the storage modulus (G') and viscosity of newly-deposited layers, resulting in bead instabilities
and failure of the print. Quantitative experimental observations on thin-wall structures suggest strategies for
mitigating this failure mode through selection of print parameters and tailoring of viscoelastic properties of
the feedstock resin.
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SAMPE Journal - September/October 2019
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SAMPE Journal - September/October 2019 - Cover1
SAMPE Journal - September/October 2019 - Cover2
SAMPE Journal - September/October 2019 - Table of contents
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