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Title: Fiber Orientation Effects in Fused Filament Fabrication of Air-Cooled Heat Exchangers

Fused filament fabrication (FFF) is a type of additive manufacturing based on material extrusion that has long been considered a prototyping technology. However, the right application of material, process, and product can be used for manufacturing of end-use products, such as air-cooled heat exchangers made by adding fillers to the base polymer, enhancing the thermal conductivity. Fiber fillers lead to anisotropic thermal conductivity, which is governed by the process-induced fiber orientation. This article presents an experimental study on the microstructure-property relationship for carbon fiber-filled polyamide used in FFF. Furthermore, the fiber orientation is measured by micro-computed tomography, and the thermal conductivity of manufactured samples is measured. Although the thermal conductivity is raised by more than three times in the fiber orientation direction at a load of only 12 vol.%, the enhancement is low in the other directions, and this anisotropy, along with certain manufacturing restrictions, influences the final part performance.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Grant/Contract Number:
AR0000573
Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 70; Journal Issue: 3; Journal ID: ISSN 1047-4838
Publisher:
Springer
Research Org:
Univ. of Wisconsin-Madison, Madison, WI (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1462036

Mulholland, T., Goris, S., Boxleitner, J., Osswald, T. A., and Rudolph, N.. Fiber Orientation Effects in Fused Filament Fabrication of Air-Cooled Heat Exchangers. United States: N. p., Web. doi:10.1007/s11837-017-2733-8.
Mulholland, T., Goris, S., Boxleitner, J., Osswald, T. A., & Rudolph, N.. Fiber Orientation Effects in Fused Filament Fabrication of Air-Cooled Heat Exchangers. United States. doi:10.1007/s11837-017-2733-8.
Mulholland, T., Goris, S., Boxleitner, J., Osswald, T. A., and Rudolph, N.. 2018. "Fiber Orientation Effects in Fused Filament Fabrication of Air-Cooled Heat Exchangers". United States. doi:10.1007/s11837-017-2733-8.
@article{osti_1462036,
title = {Fiber Orientation Effects in Fused Filament Fabrication of Air-Cooled Heat Exchangers},
author = {Mulholland, T. and Goris, S. and Boxleitner, J. and Osswald, T. A. and Rudolph, N.},
abstractNote = {Fused filament fabrication (FFF) is a type of additive manufacturing based on material extrusion that has long been considered a prototyping technology. However, the right application of material, process, and product can be used for manufacturing of end-use products, such as air-cooled heat exchangers made by adding fillers to the base polymer, enhancing the thermal conductivity. Fiber fillers lead to anisotropic thermal conductivity, which is governed by the process-induced fiber orientation. This article presents an experimental study on the microstructure-property relationship for carbon fiber-filled polyamide used in FFF. Furthermore, the fiber orientation is measured by micro-computed tomography, and the thermal conductivity of manufactured samples is measured. Although the thermal conductivity is raised by more than three times in the fiber orientation direction at a load of only 12 vol.%, the enhancement is low in the other directions, and this anisotropy, along with certain manufacturing restrictions, influences the final part performance.},
doi = {10.1007/s11837-017-2733-8},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 3,
volume = 70,
place = {United States},
year = {2018},
month = {1}
}