Ein numerisches Modell zur Simulation und zum Design des Partikelbett-3D-Druckprozesses
Zusammenfassung der Projektergebnisse
The project addresses the emerging subject of Particle-bed 3D Printing and suggests an innovative numerical approach to simulate and predict the printing process. The technology studied in this project is Selective Paste Intrusion (SPI), which is based on a localised intrusion of cement paste into a bed of aggregates and the subsequent hardening. This technology has been successfully used to print small and medium-sized objects as well as large-scale building elements, but it has not been widely implemented. To enable widespread use in the construction industry, fundamental questions must be addressed regarding process optimisation, paste and particle bed properties. The prediction of cement paste penetration into the particle layers and the resulting penetration depth are central questions in process optimization. The penetration depth determines the quality of the produced component, including its mechanical properties, durability, and shape accuracy. The aim of the project was to study the process of the SPI experimentally and numerically to predict cement paste propagation through the particle bed. The first step involved developing a computational model to describe the flow of cement paste into the bed of aggregates. The model describes the cement paste as a Bingham fluid and the particle bed as a porous medium. It was implemented in numerical software and its performance was verified in various experimental and numerical tests. Simultaneously, the rheology of the paste, including yield stress, plastic viscosity, and thixotropy, as well as the properties of the porous medium, such as permeability, porosity, and shift factor, were experimentally investigated. The developed numerical tool was then validated in the printing experiment. The results indicate that the numerical model accurately depicts the printing process and predicts the final penetration depth of the cement paste, which is crucial for layer bonding.
Projektbezogene Publikationen (Auswahl)
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Projektstart DFG-Forschungsvorhaben „Ein numerisches Modell zur Simulation und zum Design des Partikelbett-3D-Druckprozesses“, DBV-Rundschreiben, vol. 269, pp. 10-11, März 2021
Vasilic, K.
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A Numerical Model for Simulating Particle Bed 3D Printing. RILEM Bookseries, 474-481. Springer Nature Switzerland.
Vasilic, Ksenija; Udayakumar, Raja Ganesh; Böhler, David; Mai, Inka & Lowke, Dirk
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PhD-Workshop mit Dr. Nicolas Roussel zu den Ergebnissen des Projekts “A Numerical Model for Simulation and Design of Particle-Bed 3D-Printing Process”, January 2024
Böhler, D. & Udayakumar, R.G.
