Development and auxetic characterization of 3D composites produced with newly-designed multi-cell flat-knitted spacer fabrics. Issue 2 (June 2022)

• Record Type: Journal Article
• Authors: Moshtaghian, Zahra; Hasani, Hossein; Zarrebini, Mohammad; Pourheidar Shirazi, Mohammad
• Is Part Of: Journal of industrial textiles. Volume 51:Issue 2(2022)Supplement
• Page Start: 2010S
• Page End: 2025S
• Publication Date: 2022-06
• Subjects: Auxetic materials -- Poisson's ratio -- multi-cell flat-knitted spacer fabrics -- 3D textile composites; Textile fabrics -- Periodicals; Textile industry -- Periodicals; 677.005
• DOI: 10.1177/1528083720971696
• Languages: English
• ISSNs: 1528-0837

Abstract

The paper deals with development and characterization of 3D sandwich composite structures reinforced with newly-designed multi-cell flat-knitted spacer fabrics in terms of compressive behaviour and Poisson's ratio. Multi-cell spacer knitted preforms was produced on a computerized flat knitting machine. 3D composite samples with three different cross-sectional geometries were prepared via vacuum assisted resin transfer moulding method. Quasi-static compressive experiments were carried out on the prepared 3D composite samples. The Poisson's ratio of re-entrant 3D knitted composite varied between -6 and -1, which clearly points to existence of auxetic behaviour of the samples. The re-entrant 3D composites also demonstrated the highest initial slope and area under the compression force-displacement curve than spear-head or hexagonal composite structures which refer to higher energy absorbing capacity. The Poisson's ratio of 3D regular hexagonal knitted composites at small strain was usually 4 which gradually decreased to 1.6 as the exerted compressive strain increased. Additionally, 3D spear-head knitted composite having zero Poisson's ratio was also developed.