| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
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| Symposium
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2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Investigating the Effect of Generalized Newtonian Fluid on the Micro-void Development within Large Scale Polymer Composite Deposition Beads |
| Author(s) |
Aigbe Awenlimobor, Douglas E Smith, Zhaogui Wang |
| On-Site Speaker (Planned) |
Aigbe Awenlimobor |
| Abstract Scope |
Continuous research on the formation and development of micro-voids within the bead microstructure of polymer composite during extrusion/deposition process is currently ongoing, considering the adverse effect these features have on part quality. A computational method is employed to investigate potential volatile-induced micro-void nucleation mechanism by simulating the evolution of a single rigid ellipsoidal fiber in purely viscous polymer extrusion/deposition flow through a BAAM nozzle. While previous studies on potential micro-void nucleation mechanisms have assumed a Newtonian fluid property definition for the polymer melt flow, the current study assesses the impact of a generalized Newtonian fluid (GNF) model on the fiber’s response. Preliminary findings based on Jeffery’s flow assumption reveal a decrease in the fiber’s orientation kinetics due to the shear-thinning fluid behavior with an accompanying reduction in the pressure distribution around the fiber’s surface for a power-law fluid with low flow behavior index which increases the likelihood for micro-void nucleation. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |