Elastic buckling and plastic collapse during 3D concrete printing

Suiker, A.S.J.; Wolfs, Rob; Lucas, Sandra S.; Salet, Theo A.M.

doi:10.1016/j.cemconres.2020.106016

Cited by 146 publications

(66 citation statements)

References 14 publications

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“…Therefore, the zigzag-shaped lateral supports printed inside the structure, especially with long connecting widths, could increase the resistance to buckling failure in 3D printed concrete structures. The test results in this study are in good agreement with those of a previous study [36], where 3D printing reinforced by zigzag internal layers inside the structure improved not only the buildability of the printed structure but also the resistance to buckling of the printed hardened structure.…”

Section: Lateral Supportssupporting

confidence: 91%

“…The parametric model used to predict the structural failure mode included the main printing process parameters, which were the curing characteristics of the printing material, the printing speed, the geometrical characteristics of the printed structure, its dead weight, its heterogeneous strength and stiffness characteristics, and the presence of geometrical imperfections. Suiker et al [36] also demonstrated the practical applicability of the model for different wall structures fabricated by 3D concrete printing.…”

Section: Lateral Supportsmentioning

confidence: 97%

“…The buildability refers to the resistance of the deposited fresh concrete to deformation during construction and the ability of the concrete to retain its extruded shape [13]. The 3D printability of concrete, especially the buildability, depends on material parameters (the rheology, green strength, and stiffness of the fresh concrete) and printing parameters (the interlayer interval time incorporated by the nozzle speed, nozzle height, RPMs of the screw, and structural stability parameter) [35,36]. This study focused on the effect of the printing parameters and structural stability parameter on the buildability of 3D printed concrete.…”

Section: Buildability In the Fresh Statementioning

confidence: 99%

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Buildability and Mechanical Properties of 3D Printed Concrete

et al. 2020

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Recently, 3D concrete printing has progressed rapidly in the construction industry. However, this technique still contains several factors that influence the buildability and mechanical properties of the printed concrete. Therefore, this study investigated the effects of the nozzle speed, the interlayer interval time, the rotations per minute (RPMs) of the screw in the 3D printing device, and the presence of lateral supports on the buildability of 3D concrete printing. In addition, this paper presents the results of the mechanical properties, including the compressive, splitting tensile, and flexural tensile strengths of 3D printed concrete. The buildability of 3D printed structures was improved with an extended interlayer interval time of up to 300 s. The printing processes were interrupted because of tearing of concrete filaments, which was related to excessive RPMs of the mixing screw. The test results also showed that a lateral support with a wide contact surface could improve the resistance to buckling failure for 3D printed structures. The test results of the mechanical properties of the 3D printed concrete specimens indicated that the compressive, splitting tensile, and flexural tensile strengths significantly depended on the bonding behavior at the interlayers of the printed specimens. In addition, although metal laths were expected to improve the tensile strength of the printed specimens, they adversely affected the tensile performance due to weak bonding between the reinforcements and concrete filaments.

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Section: Lateral Supportssupporting

confidence: 91%

Section: Lateral Supportsmentioning

confidence: 97%

Section: Buildability In the Fresh Statementioning

confidence: 99%

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Buildability and Mechanical Properties of 3D Printed Concrete

et al. 2020

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“…Consequently, this non-uniform gravitational load may threaten the overall stability of the object being printed, allowing fewer layers to be printed than otherwise expected. However, this influence has not been studied in any of the previous prediction models (Kruger Cho, et al, 2019;Roussel et al, 2020;Suiker et al, 2020;Wolfs et al, 2018. To account for the continuous printing process, each printing layer is divided into several sequential printing pieces (as indicated in Figure 6).…”

Section: Non-uniform Gravitational Loadmentioning

confidence: 99%

“…In previous 3D printing models (Suiker et al, 2020;Wolfs et al, 2018), the structure is considered to have failed when any point of the printed object has reached the material yielding. This failure criterion may be reasonable for a homogeneous system under uniform loading.…”

Section: Structural Failure Criterionmentioning

confidence: 99%

A discrete lattice model for assessment of buildability performance of 3D‐printed concrete

Chang

Chen

et al. 2021

Computer aided Civil Eng

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In this work, the lattice model is applied to study the printing process and quantify the buildability (i.e., the maximum height that can be printed) for 3D concrete printing (3DCP). The model simulates structural failure by incorporating an element birth technique, time‐dependent stiffness and strength, printing velocity, non‐uniform gravitational load, localized damage, and spatial variation of the printed object. The model can reproduce the plastic collapse failure modes reported in the literature. In this research, three main contributions for 3DCP modeling work can be found. A new failure criterion is proposed and adopted to improve the estimation of critical printing height; the element birth technique is utilized to mimic the continuous printing process and study the impact of non‐uniform gravitational load; variability of a printed structure is modeled through the inclusion of disorder during mesh generation and Gaussian distributions of material properties. Using this model, parametric analyses on non‐uniform gravitational load and material variation are conducted to assess their impact on the failure–deformation response and the critical printing height. Finally, the model is validated by comparison with two 3D printing experiments from the literature. The proposed lattice model can reproduce the correct failure‐deformation modes of two types of structures commonly used for buildability quantification: A 3D‐printed hollow cylinder and a square wall layout. Lattice modeling of the square structure yields a relative difference of around 10% with the experimental printing height. For the cylinder structure, the predicted radial deformation and corresponding height show good agreement with the experimental data; the model yields a 41.38% overprediction of the total number of printing layers, compared with the experimental data. Possible reasons for the quantitative discrepancy are discussed.

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Materialsparende Betondecke aus 3D‐gedruckten Verriegelungsblöcken

Neef,

Goertzen,

Niemeyer

et al. 2024

Beton und Stahlbetonbau

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Ein neues modulares Konstruktionsprinzip hat das Potenzial, die Betonbauweise zu revolutionieren: topologische Verriegelung von Bausteinen. Durch die innovative Anordnung dieser Verriegelungsblöcke wird eine kinematische Beanspruchung einzelner Bausteine durch die gesamte Baugruppe effektiv unterbunden, indem die Blöcke sich gegenseitig immobilisieren. Diese Studie untersucht die Synergie zwischen topologisch ineinandergreifenden Baugruppen (TIA = englisch „topological interlocking assemblies“) und 3D‐Betondruck und führt eine umfassende Analyse der Herstellungsverfahren und der strukturellen Leistungsfähigkeit durch. Die ohne Bindemittel ineinandergreifenden Verriegelungsblöcke bieten herausragende Perspektiven für nachhaltiges Bauen. In der Untersuchung wird eine Methode zur Optimierung der Blockgeometrien für den 3D‐Druck vorgestellt, um die Integrität der Verriegelung sicherzustellen. Drei spezifische Blockgeometrien werden für den 3D‐Betondruck entwickelt und getestet. Verschiedene Methoden werden angewendet, um Verriegelungsblöcke herzustellen. Eine Geometrie wird ausgewählt und sowohl im kleinen als auch im großen Maßstab erprobt. Es folgen experimentelle Prüfungen, einschließlich präziser 3D‐Fotogrammetriemessungen, zur Bewertung des strukturellen Verhaltens dieser Plattensysteme. Die Ergebnisse demonstrieren eindrucksvoll die Machbarkeit und das enorme Potenzial der Integration von topologischer Verriegelung und 3D‐Betondruck für zukunftsfähige Bauanwendungen.

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Elastic buckling and plastic collapse during 3D concrete printing

Cited by 146 publications

References 14 publications

Buildability and Mechanical Properties of 3D Printed Concrete

Buildability and Mechanical Properties of 3D Printed Concrete

A discrete lattice model for assessment of buildability performance of 3D‐printed concrete

Materialsparende Betondecke aus 3D‐gedruckten Verriegelungsblöcken

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