Oszillation in textilen, tribologischen Kontakten

• Oscillation at the Tribological Contacts in Textiles

Huck, Lisa Katharina; Gries, Thomas (Thesis advisor); Jacobs, Georg (Thesis advisor)

Düren : Shaker Verlag (2021)
Book, Dissertation / PhD Thesis

Dissertation, RWTH Aachen University, 2021

Abstract

During the production of fabric for fibre composite components, friction and wear result in the breakage of individual filaments of the reinforcing fibres. To keep the filament breakage at a reasonably low rate, the process speed is reduced. One of the key challenges in the processing of brittle reinforcing fibres, such as carbon fibres, is the high strain on the filaments at the yarn guiding elements in textile machines. This thesis describes the tribological contact between a vibrating fibre and a fibre guiding element. The aim of this thesis is to improve the understanding of fibre vibration effects on friction in the contact between fibre and fibre guiding element. The findings can be used, for example, to increase process speeds and to further optimise the production process. In this work, a new approach is developed to reduce the friction between fibres and fibre guiding elements in textile machines. This friction is influenced by vibrational excitation. It is shown that the friction between fibres and fibre guiding elements can be reduced, on average, by 30 % by means of oscillating fibres. In addition, the effect of fibre oscillation on the filament breakage rate due to processing is examined. First, the tribosystem is analysed theoretically and examined in the laboratory. Thereafter, the results are validated in the pilotplant and in field trials in industry. The technology of friction reduction through vibration excitation at the tribological contacts in textiles is promising for many other textile processes and various materials. In the Outlook, some examples of further potential applications are presented. Overall, this dissertation provides the basis for transferring vibration-based friction reduction to any textile tribological systems.