Abstract
Material-extrusion (MatEx) additive manufacturing involves layer-by-layer assembly of extruded material onto a printer bed and has found applications in rapid prototyping. Both material and machining limitations lead to poor mechanical properties of printed parts. Such problems may be addressed via an improved understanding of the complex transport processes and multiphysics associated with the MatEx technique. Thereby, this review paper describes the current (last 5 years) state of the art modeling approaches based on momentum, heat and mass transfer that are employed in an effort to achieve this understanding. We describe how specific details regarding polymer chain orientation, viscoelastic behavior, and crystallization are often neglected and demonstrate that there is a key need to couple the transport phenomena. Such a combined modeling approach can expand MatEx applicability to broader application space, thus we present prospective avenues to provide more comprehensive modeling and therefore new insights into enhancing MatEx performance.
Original language | English |
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Pages (from-to) | 3-17 |
Number of pages | 15 |
Journal | Progress in Additive Manufacturing |
Volume | 6 |
Issue number | 1 |
DOIs | |
State | Published - Feb 2021 |
Externally published | Yes |
Funding
A.D would like to acknowledge funding from the Adhesives and Sealants Graduate Research Assistantship from the Macromolecules Innovation Institute (MII) at Virginia Tech. C.M would like to acknowledge funding from the Royal Commission for the Exhibition of 1851.
Funders | Funder number |
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Royal Commission for the Exhibition of 1851 |
Keywords
- Constitutive models
- Flow deposition
- Flow-induced crystallization
- Heat transfer
- Material extrusion