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J. Compos. Sci. 2018, 2(3), 45; https://doi.org/10.3390/jcs2030045

Process-Induced Fiber Orientation in Fused Filament Fabrication

1
Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
2
AREVO, Inc., Santa Clara, CA 95054, USA
*
Author to whom correspondence should be addressed.
Received: 2 July 2018 / Revised: 12 July 2018 / Accepted: 27 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Discontinuous Fiber Composites)
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Abstract

As the applications for additive manufacturing have continued to grow, so too has the range of available materials, with more functional or better performing materials constantly under development. This work characterizes a copper-filled polyamide 6 (PA6) thermoplastic composite designed to enhance the thermal conductivity of fused filament fabrication (FFF) parts, especially for heat transfer applications. The composite was mixed and extruded into filament using twin screw extrusion. Because the fiber orientation within the material governs the thermal conductivity of the material, the orientation was measured in the filament, through the nozzle, and in printed parts using micro-computed tomography. The thermal conductivity of the material was measured and achieved 4.95, 2.38, and 0.75 W/(m·K) at 70 °C in the inflow, crossflow, and thickness directions, respectively. The implications of this anisotropy are discussed using the example of an air-to-water crossflow heat exchanger. The lower conductivity in the crossflow direction reduces thermal performance due to the orientation in thin-walled parts. View Full-Text
Keywords: thermal conductivity; fiber orientation; composite; filler; heat exchanger; copper thermal conductivity; fiber orientation; composite; filler; heat exchanger; copper
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style

Mulholland, T.; Goris, S.; Boxleitner, J.; Osswald, T.A.; Rudolph, N. Process-Induced Fiber Orientation in Fused Filament Fabrication. J. Compos. Sci. 2018, 2, 45.

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