Modelling of 3D concrete printing based on computational fluid dynamics

被引：133

作者：

Comminal, Raphael ^{[1
]}

da Silva, Wilson Ricardo Leal ^{[2
]}

Andersen, Thomas Juul ^{[2
]}

Stang, Henrik ^{[3
]}

Spangenberg, Jon ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Mech Engn, Lyngby, Denmark

[2] Danish Technol Inst, Taastrup, Denmark

[3] Tech Univ Denmark, Dept Civil Engn, Lyngby, Denmark

来源：

CEMENT AND CONCRETE RESEARCH | 2020年 / 138卷

关键词：

3D concrete printing; Computational fluid dynamics; Layer geometry; Parametric study; Rheology; MECHANICAL-PROPERTIES; YIELD-STRESS; EXTRUSION; ORIENTATION; FLOW;

D O I：

10.1016/j.cemconres.2020.106256

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents a computational fluid dynamic model of 3D Concrete Printing. The numerical simulation is used to predict the cross-sectional shape of 3D printed segments through "virtual printing" simulations. An experimental parametric study of the layer geometry is also conducted for a wide range of processing printing speeds and nozzle heights. The constitutive behavior of the cement-based mortar used in experiments is characterized by rotational and oscillatory rheological tests, and it is modelled with a Bingham constitutive law. Moreover, two formulations of the constitutive law are used in the simulations: the generalized Newtonian fluid model, and the elasto-visco-plastic fluid. Overall, the numerical results agree well with the experiments, validating the proposed computational fluid dynamics modelling approach. Finally, an example of multi-layer print simulations as well as research prospects are presented.

引用

页数：12

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