About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Carbon Fiber Suspension Dynamics Analysis via Coupled CFD - DEM Simulations for Additive Manufacturing Polymer Melt Flows |
Author(s) |
Jason Pierce, Douglas Smith |
On-Site Speaker (Planned) |
Jason Pierce |
Abstract Scope |
Bead microstructures formed though large-scale polymer extrusion/deposition additive manufacturing of short fiber polymer composites are defined by the distribution and orientation of fibers during processing. This research models carbon fiber motion within nozzles through coupled computational fluid dynamics (CFD) and discrete element modeling (DEM) simulations. Our approach models fibers as bonded discrete spheres, which allows for tracking of individual flexible and breakable fibers. DEM simulation parameters are calibrated to produce Jeffery’s orbit for single fibers in simple shear flow. The DEM extrusion simulation includes fibers that interact with each other and the nozzle geometry while being driven by CFD-generated velocity fields. Our results are compared with Computational Tomography (CT) images of bead microstructures produced on our large area additive manufacturing printer and orientation tensor results computed from established theory. The results are expected to provide valuable insight for future work on part strength, layer path optimization, and nozzle design. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |