<p>Extrusion
Deposition Additive Manufacturing (EDAM) is a process in which fiber-filled
thermoplastic polymers are mixed and melted in an extruder and deposited onto a
build plate in a layer-by-layer basis. Anisotropy caused by flow-induced
orientation of discontinuous fibers along with the non-isothermal cooling
process gives rise to internal stresses in printed parts which results in part
deformation. The deformation and residual stresses can be abated by modifying
the fiber orientation in the extrudate to best suit the print geometry. To that
end, the focus of this research is on understanding the effect of fiber
orientation state and fiber properties on effective properties of the printed
bead and the final deformation of a part. The properties of three different
orientation tensors of glass fiber-filled polyamide and carbon fiber-filled
polyamide were experimentally and virtually characterized via micromechanics. A
thermo-mechanical simulation framework developed in ABAQUS© was used to
understand the effects of the varying fiber orientation tensor and fiber
properties on the final deformation of printed parts. In particular, a
medium-size geometry that is prone to high deformation was simulated and
compared among the three orientation tensors and two material systems. This
serves to be a good preliminary study to understand microscopic properties induced
deformations in EDAM.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/12543464 |
| Date | 25 June 2020 |
| Creators | Pasita Pibulchinda (9012281) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/The_Effects_of_Fiber_Orientation_State_of_Extrusion_Deposition_Additive_Manufactured_Fiber-Filled_Thermoplastic_Polymers/12543464 |
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