Definition und Quantifizierung der Drapierbarkeit von multiaxialen Gelegen durch die Vermessung von Einzeleffekten

Abstract

This dissertation presents a definition of drapeability that is meant to broaden its scope to include not only the important effects of shearing and wrinkling, but all constituent effects such as gap formation, undulations, loops (tow buckling) and fabric anisotropy. This definition is complemented by an experimental test device to measure and quantify all of these effects in a single, standardized setup (available as the Textechno Drapetest). The Drapetest utilizes optic measurement technology that is coupled with digital image anlysis software to detect and measure fibre positions and orientation, and fabric topology. For each of the defined drapeability effects characteristic values were generated from this optical data that can describe the intensity, distribution and extent of the effect in question. The device and methodology was empirically validated using a set of 72 specially manufactured glass fibre NCF. The interdependencies between textile design, process parameters, and drapeability effects and a semi-analytical equation for them are shown. A method to use these semi-analytical equations in the composite design process is introduced.