Basic investigations on the robot-aided magnetic distribution and alignment of microsteel fibers in thin-walled UHPFRC components

提出的研究项目的目的是通过UHPFRC（超高性能纤维增强混凝土）中钢纤维的受控、基于机器人的磁性分布和取向，探索资源节能型部件制造过程的基础。拟议的研究项目一方面是基于数字化和机器人支持的组件制造提供的可能性，另一方面是基于纤维对准提高UHPFRC材料效率的潜力。钢纤维在UHPFRC中的分布和取向方法是基于磁性物理现象。由于钢纤维是铁磁性的，磁场可以选择性地改变它们在新混凝土中的位置。研究项目的目的是在生产过程中，根据力的流动和“形随力”的格言，使钢纤维在混凝土基体中的位置对齐。这种纤维在组件中的明确排列旨在显著提高所使用纤维组件的有效性，并且除了改善可加工性外，还可大大减少所使用的纤维，因此提供了节约生态和经济资源的巨大潜力。通过使用机器人生产领域的最新发展来确保过程的可重复性控制，将对该方法的经济，建筑实际应用起决定性作用。如果可能的话，第一个工作包的结果应该被整合到DFG优先计划1542“混凝土轻建筑”的子项目中，该项目将在ITE和iBMB持续到2017年底。特别是，该方法可用于生产模块化结构的杆和表面元件（板）以及高应力连接部位（齿连接），目的是实现这些高性能部件的性能明显提高。光纤对准代表了在未来的数字制造链中生产组件的几个对齐的加工步骤之一。这种磁性光纤对准方法的实际应用是多种多样的，适用于不同的元件群。因此，在大面积组件（例如工业地板）的情况下，纤维含量可以通过定义纤维取向来显着减少。此外，该方法可用于增加局部高应力区域的抗拉强度，例如在组件连接区域或用于跨结构厚度的材料性能分级。此外，研究项目的目标是针对特定区域替代常规钢筋，如双t梁或UHPFRC空心梁的推力钢筋。

The aim of the proposed research project is to explore the basis for the manufacturing process of resource-efficient components by means of the controlled, robot-based magnetic distribution and orientation of steel fibers in UHPFRC (Ultra-High Performance Fibre-Reinforced Concrete). The proposed research project is based on the possibilities offered by digital and robot-supported component manufacturing on the one hand and the potential of fiber alignment to increase the material efficiency of UHPFRC on the other. The method of distributing and orienting steel fibers in UHPFRC is based on the physical phenomenon of magnetism. Since steel fibers are ferromagnetic, magnetic fields can selectively modify their position in fresh concrete. The aim of the research project is to align the position of the steel fibers in the concrete matrix during the production process according to the force flow and the maxim “form follows force”. This defined arrangement of the fibers in a component is intended to significantly increase the effectiveness of the fiber component used and, in addition to improved workability, lead to a considerable reduction in the fibers used, as a result of which a great potential for savings in ecological and economic resources is provided. The reproducible control of the process, which is ensured by the use of the latest developments in the field of robotic production, will be decisive for an economic, building-practical application of the method. The results of the first work packages should, if possible, be integrated into the sub-project of the DFG's Priority Program 1542 "Light Construction with Concrete", which runs until the end of 2017 at the ITE and iBMB. In particular, the method could be used in the production of modularly constructed rod and surface elements (plates) as well as in the highly stressed joint sites (tooth connections) with the aim of achieving a clear increase in performance of these high-performance components. The fiber alignment represents one of several aligned processing steps for the production of a component in a prospective digital manufacturing chain. The practical applications for this method of magnetic fiber alignment are manifold and conceivable for different component groups. Thus, the fiber content in the case of large-area components, e.g. industrial flooring, can be significantly reduced by a defined fiber orientation. Further, the method can be used to increase the tensile strength in locally highly stressed areas, e.g. in the component joining areas or for the gradation of material properties across the structural thickness. In addition, the research project aims at the area-specific replacement of conventional reinforcement, such as the thrust reinforcement in double T-beams or hollow beams made of UHPFRC.