Jacquet Yohan, Perrot Arnaud
IRDL, UMR CNRS 6027, Université de Bretagne Sud, 56100 Lorient, France.
Materials (Basel). 2023 Jul 20;16(14):5110. doi: 10.3390/ma16145110.
Of the digital concrete-additive-manufacturing techniques, extrusion-based systems are probably the most widespread and studied. Despite the significant potential offered by 3D printing, several challenges must still be overcome. For instance, although several solutions have already been explored, the automated reinforcement of the layer-wise printed structures represents a challenge. The inline quality control of the fresh-state properties of 3D-printed materials is also an open question that needs to be addressed to find an efficient shared practice. This study proposes a new device designed to simultaneously reinforce 3D-printed structures along and through the layers and to be used as an inline quality-control device. This device consists in a sewing system, which is composed of a rotating system, and a hollow needle, which drives a reinforcing cable or yarn and can be used to inject cement grout to fill holes and improve bonding with reinforcement. The rotation is induced by a stepper motor, which measures the torque that is required to make the needle penetrate. This measurement can be used as a quality-control index to ensure material homogeneity. This paper aims to present an original reinforcement system that can be fully automated and simultaneously create reinforcement patterns in different directions of the printed structure while controlling the material's fresh properties.
在数字混凝土增材制造技术中，基于挤出的系统可能是应用最为广泛且研究最多的。尽管3D打印具有巨大潜力，但仍有若干挑战有待克服。例如，虽然已经探索了多种解决方案，但对逐层打印结构进行自动增强仍是一项挑战。对3D打印材料的新拌状态特性进行在线质量控制也是一个需要解决的开放性问题，以便找到一种高效的通用方法。本研究提出了一种新装置，旨在同时沿层内和跨层增强3D打印结构，并用作在线质量控制装置。该装置由一个缝纫系统组成，该缝纫系统包括一个旋转系统和一根空心针，空心针用于驱动增强电缆或纱线，还可用于注入水泥浆以填充孔洞并改善与增强材料的粘结。旋转由步进电机驱动，步进电机测量使针穿透所需的扭矩。该测量值可作为质量控制指标以确保材料均匀性。本文旨在介绍一种可完全自动化的新型增强系统，该系统可在控制材料新拌特性的同时，在打印结构的不同方向上同时创建增强图案。
