Numerical simulation of construction 3D printing process. Problems and solution methods

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The numerical modeling methods of the construction 3D-printing process with concrete are analyzed from the point of view of the variable geometry printed objects stability numerical simulation possibilities. The method of computational fluid dynamics (finite volume method) implemented in CFD-complexes (ANSYS Fluent, OpenFOAM, COMSOL) was found effective for modeling and process control. The method and CFD tools applicability to solve the printing process modeling and controlling problem is determined by the numerical simulation possibility of concrete mixture flow during extrusion and layers formation, geometric conformity and structures stability prediction, taking into account the mixture rheological properties (viscosity, yield strength and thixotropy) and their change in time. A distinctive feature of the developed generalized approach and the 3D printing process numerical model is the mixture rheological parameters usage. The requirements for the nomenclature and range of its values have been determined experimentally. As part of this approach implementation experimental studies of rheological behavior by shear rheometry were carried out for three types of mixtures. During the model elements 3D printing their quality and stability in dependence with the mixtures type and technological characteristics were assessed. As a result, the rheological behavior rational model of and the values range of visco-plastic mixture parameters ensuring its suitability for extrusion and layering is substantiated. These include effective viscosity and Bingham yield strength, which determine the mixture extrusion quality; static viscosity and plastic strength, static yield strength, on which the layer shape, preservation and the printed structure stability are depended.

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作者简介

G. Slavcheva

Voronezh Technical University

编辑信件的主要联系方式.
Email: gslavcheva@yandex.ru

Doctor of Sciences (Engineering) 

俄罗斯联邦, 84, 20-letiya Oktyabrya Street, Voronezh, 394006

V. Telichko

Voronezh Technical University

Email: katranv@yandex.ru

Doctor of Sciences (Engineering) 

俄罗斯联邦, 84, 20-letiya Oktyabrya Street, Voronezh, 394006

P. Yurov

Voronezh Technical University

Email: yurov.py@yandex.ru

Postgraduate Student 

俄罗斯联邦, 84, 20-letiya Oktyabrya Street, Voronezh, 394006

D. Babenko

Voronezh Technical University

Email: teleperedoz@mail.ru

Candidate of Sciences (Engineering) 

俄罗斯联邦, 84, 20-letiya Oktyabrya Street, Voronezh, 394006

参考

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2. Fig. 1. CAD model (а) and model element printing path (b)

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3. Fig. 2. Instruments and devices for evaluating technological properties of mixtures: а – measuring the diameter of the mixture spreading on a vibrating table; b – device for checking the plastic strength; c – scheme of testing the samples for shape resistance

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4. Fig. 3. Rheological curves of cement mixtures: а – C – W; b – C – W – SP; c – C – W – SP – MK

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5. Fig. 4. Results of model element 3D printing using CD – W mixture at the extruder screw speed: а – 35 rot/min; b – 10 rot/min

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6. Fig. 5. Results of model element 3D printing using CD – W –SP mixture at the extruder screw speed 10 rot/min: а – printing start; b – printing end

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7. Fig. 6. Results of model element 3D printing using CD – W –SP – MK mixture at the extruder screw speed 10 rot/min: а – printing start; b – printing end

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