A1/II Gradient 3D-reinforcing structures with integrated in-situ sensors
The quantification of impact energy and transmission mechanisms is essential to gain in-depth insights into the highly complex, impact-specific reinforcing effect of structural components based on continuous fibers in mineral-bonded composites. Existing approaches involve analyses on the composite surface to determine strain and oscillation, thus yielding delayed and inaccurate results on processes occurring within the component. Concepts and methods for structurally compatible real-time in-situ measuring systems have not yet been developed; these systems would not mechanically affect the specimen under short-term dynamic stress, but still provide spatially and temporally resolved information on impact-induced wave transmission and resulting damages with high accuracy in terms of orientation, layer, and location. The fundamental structure-property relations derived from these results will enable the design of 3D reinforcement components suitable for specific impact scenarios.
Left to right: Structure and sensor development for reinforcing elements that are based on continuous fibers and suitable for impact scenarios; impact testing technology
This project is aimed at developing 3D reinforcement components that are based on continuous fibers and suitable for impact scenarios. These components will possess gradient properties in load direction and will be functionalized with textile-based, structurally integrated sensor networks. Their specific design will enable these sensor networks to generate high-resolution information on impact-induced wave transmission in different directions, layers, and distances from the site of the impact. Thus, in combination with additional external measuring technology, impact test stands, high-speed cameras, and digital image correlation, comprehensive information will be obtained. Subsequently, these results will be analyzed algorithmically (e.g. using modal analysis) and put into relation with composite structure and material properties. By means of the determined structure-property relations, these 3D continuous fiber reinforcement components will be further modified and structural-mechanical composite models will be validated.