Paper Number
AM12                         My Program 

Session
Additive and Advanced Manufacturing of Polymers and Particles

Title
A rheology-based strategy for designing 3D printing processes

Presentation Date and Time
October 16, 2024 (Wednesday) 3:45

Track / Room
Track 4 / Waterloo 6

Authors (Click on name to view author profile)

1. Caron, Elise (Ghent University, Department of Materials, Textiles and Chemical Engineering)
2. Farràs-Tasias, Laia (Ghent University, Department of Materials, Textiles, and Chemical Engineering)
3. Marchesini, Flavio H. (Ghent University, Department of Materials, Textiles and Chemical Engineering)

Author and Affiliation Lines (in printed abstract book)
Elise Caron, Laia Farràs-Tasias and Flavio H. Marchesini
Department of Materials, Textiles and Chemical Engineering, Ghent University, Zwijnaarde 9052, Belgium

Speaker / Presenter 
Marchesini, Flavio H.

Keywords
experimental methods; theoretical methods; additve manufacturing; advanced manufacturing; colloids; emulsions; flow-induced instabilities; gels; non-Newtonian fluids; polymer solutions; suspensions

Text of Abstract
3D printing technologies based on pumping a material in a soft state through a nozzle and depositing it layer-by-layer in a prescribed spaced have been considered the most promising methods to manufacture complex products composed of a wide range of different materials. These technologies have been investigated for the manufacturing of foods, organs, flexible electronics, shape morphing systems, and lightweight structures. However, the development of 3D-printed products is still limited by the trial-and-error approach that is widely employed. There is still a lack of understanding on the strong coupling between material rheology at soft state, solidification process and the governing printing parameters. This gap hinders the development of a next generation of multimaterial 3D printing processes. In this talk, we discuss the rheology design principles for the 3D printing of complex materials. The different stages of 3D printing are considered and a set of model-based design criteria for material rheology are discussed in view of recent advances in this field [1,2]. Rheological phenomena during printing, such as avalanche effect during startup flow, extrudate swell, and gravitational collapse due to yielding are discussed. Moreover, it is shown how to employ these criteria to design complex soft products or lightweight structures in a way to overcome the trial-and-error approach and minimize the number of required experiments.

References:

[1] E. Caron, D. Van de Walle, K. Dewettinck, and F. H. Marchesini, in. prep.

[2] F. H. Marchesini, R. M Oliveira, H. Althoff, and P. R. de Souza Mendes, J. Rheol. 63(2), 2019.