Analysis of the draping behaviour of locally reinforced fabrics for the production of complex preforms
Themes: Building & Construction, Leichtbau
The combination of preforming based on textile semi-finished products and liquid impregnation processes with duroplastic matrices, so-called liquid composite molding (LCM), represents an economical and technical process combination for industrial mass production. The components produced in this process consist of homogeneous individual layers with fixed, constant fibre orientations and grammages, which are cut from uniform semi-finished products. For the production of components from these materials, a large number of individual process steps are necessary to produce the preform, whereby the preforming causes up to 50 % of the costs of the final component.
One approach to reducing production costs is the local integration of reinforcing elements in the textile manufacturing process. In this way, complex process steps can be shifted from the actual preforming process to the production of semi-finished products. By incorporating two independent reinforcing fiber systems into the base fabric, the Open Reed Weaving (ORW) process offers the possibility of load-path-compliant component design.
The most important and quality-determining step in the process chain is automated draping. By forming the two-dimensional textile into its three-dimensional contour, the fiber orientations of the later component are determined, whereby with additional fiber orientations defined after optimization, the performance of the later part is significantly determined by maintaining the fiber directions. This requires a detailed understanding of the draping process in order to produce high quality preforms. At present, however, there are no studies on the draping behaviour of these textiles. For this reason, the Institute of Textile Technology at RWTH Aachen University is working on a detailed investigation of the draping behaviour of locally reinforced fabrics. These are presented in the poster.