Layer pressing in concrete extrusion-based 3D-printing: Experiments and analysis
Layer pressing in concrete extrusion-based 3D-printing: Experiments and analysis
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DOI：
10.1016/j.cemconres.2022.106741
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发表时间：
2022-03-26
影响因子：
11.4
通讯作者：
Roussel, Nicolas
中科院分区：
文献类型：
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作者：
Carneau, Paul;Mesnil, Romain;Roussel, Nicolas
层压策略广泛用于大型混凝土 3D 打印，因为它能够很好地控制层横截面几何形状，从而控制最终的整体打印元件几何形状。然而，虽然层压可确保挤出层上表面的精确定位，但由于喷嘴下材料的挤压，它可能是子层变形的根源。在如此复杂的流动类型中，打印参数（即层厚度、打印速度和材料流速）的设置仍然主要来自耗时的实验试错过程，而不是来自对底层力学的理性理解。因此，本文的目的是深入了解打印参数对挤出层的几何形状和局部稳定性的影响。通过研究几何和运动学参数以及新材料特性的影响，讨论了受控层压的一些上限和下限要求。最后，提出了通用打印参数图，允许对挤出材料的行为进行分类。
The Layer Pressing Strategy is widely used in large-scale concrete 3D Printing for its capacity to provide good control over the layer cross-section geometry and, consequently, the final overall printed element geometry. However, although layer pressing ensures exact positioning of the extruded layer upper surface, it may be at the origin of some deformation of the sub-layers, due to the squeezing of the material under the nozzle. In such a complex flow typology, the setting of the printing parameters, namely layer thickness, printing velocity and material flow rate, still mainly result from time-costly experimental trial-and-errors procedures rather than from a rational understanding of the underlying mechanics. The aim of this article is therefore to provide insights on the effects of the printing parameters on the geometry and local stability of the extruded layer. Some upper and lower bound requirements for controlled layer pressing are discussed from the study of the influence of geometric and kinematic parameters, along with fresh material properties. Finally, a generic printing parameters map is proposed, allowing for the classification of the behaviour of the extruded material.