Influence of machine settings on mechanical performance of yarn and textile structures: Fid-Bau Portal

Influence of machine settings on mechanical performance of yarn and textile structures

Hanisch, V. / Kolkmann, A. / Roye, A. / Gries, T.

Different yarn and textile structures are examined within the Collaborative Research Center on textile reinforced concrete in Aachen. The scope of the latest research work is to examine the influence of different machine settings on the mechanical performance. These examinations were done for both, yarn and textile structures. Within the yarn structures cabled yarns were examined. The production of these yarn structures is shown in the presentation. Within the examinations the different yarn structures were tested in a tensile test of the dry material. In addition, the influence of a second winding was examined. During the production process of the textile structures, the stitching length as well as the binding type were varied. Due to the different stitching lengths the shape of the yarn crosssection changes which leads to a different mechanical behavior. Different textile structures are shown in the presentation. In the examinations, the textile structures were embedded in concrete and a tensile test was performed. Among the yarn structures, the manufacturing process of cabled yarn is described. The effect of machine parameters on the tensile characteristics of cabled AR glass rovings of different linear densities with polyamide yarn as covering yarn was examined. Polynomial models and regression equations that adequately reflect the dependence of the machine parameters on the tensile characteristics were obtained and presented. The analysis of these models allowed determining the optimum parameters for cabled AR glass rovings with polyamide yarn. For the 2D structures described in this paper, the influence of the loop length and the winding process is presented. An increasing loop length results in lower forces in the tensile test of the dry roving but in higher forces testing the composite part. As the winding process leads to a large amount of filament breakage, a direct processing of the rovings should be realized to obtain a maximum in tensile strength. In addition to the 2D structures, spacer fabrics were investigated. The diameter of the spacer yarn and the patterning was varied. The results of the compression test show a large influence of these parameters on the compression strength. The investigations presented in this paper show a high influence of varied machine settings within the different production processes on the mechanical performance of yarn and textile structures. Furthermore, they show that higher tensile or compression strengths can be obtained by choosing optimum machine settings.