About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Influence of Bead Geometry and Flow Rate on the Thermomechanical Performance of Large-Format Printed Polymer Composites |
Author(s) |
Tyler Corum, Johnna O'Connell, Samuel Pankratz, Maximilian Heres, Jeff Foote, Chad Duty |
On-Site Speaker (Planned) |
Tyler Corum |
Abstract Scope |
The LOCI-One system is a large-format additive manufacturing (LFAM) system that was used to print single bead walls made of 20% by weight carbon fiber reinforced acrylonitrile butadiene styrene (CF-ABS). Various inputs were used for layer time, print head speed, and bead width to observe the influence of print parameters on thermomechanical performance. Microscopy revealed a “thinning effect” experienced by the highly oriented fiber shell as bead width increased. Coefficient of thermal expansion (CTE) results captured the mesostructural influence on thermomechanical response. Increased shear rates were expected to lower CTE in the x-direction (CTEx) due to higher fiber alignment; however, this relationship was not always observed. For larger bead widths (higher shear rates), the random fiber core dominated thermomechanical response and increased CTEx overall. Interlayer strength showed a rapid decrease in bonding between layers as layer time exceeded the time required for the extrudate to cool below glass transition temperature. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |