Out–of–plane capillary pressure of technical textiles. (September 2019)

• Record Type: Journal Article
• Authors: Willenbacher, Björn; May, David; Mitschang, Peter
• Is Part Of: Composites. Volume 124(2019)
• Publication Date: 2019-09
• Subjects: A. Fabrics/textiles -- B. Permeability -- C. Resin flow -- D. Liquid composite molding; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2019.105495
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: Textile permeability characterization often follows an unsaturated approach, i.e. a dry textile is impregnated by a fluid and flow front movement is monitored. For permeability calculation based on Darcy's law, a pressure-driven injection is commonly applied. Depending on flow velocity, capillary pressure can also contribute to flow movement, which would lead to a calculation error if not considered. This again requires capillary pressure determination. In the present work, a novel measurement system for out-of-plane capillary pressure based on weight increase was developed and applied to characterize the out–of–plane capillary pressure of a random mat, a twill 2/2 woven fabric, and a biaxial non-crimp fabric (all glass fiber) at three different fiber volume contents. Silicone oil was used as measurement fluid. Capillary pressures ranged between 150 and 225 Pa.