Abstract
A conventional compound fabric was used to develop a modern, multifunctional material with an auxetic behaviour and a tailored open area for particle filtration. Such material was produced using traditional textile technology and laser cutting, to induce a rotating squares unit geometry. The behaviour was investigated of three different rotating unit cell sizes. The laser slit thickness and the length of the hinges were equal for all three-unit cells. The tensile properties, Poisson’s ratio and auxetic behaviour of the tested samples were investigated, especially the influence of longitudinal displacement on the fabric’s open area and the filtered particle sizes (average and maximum). Results show that the developed compound fabric possesses an average negative Poisson’s ratio of up to −1, depending on the applied auxetic geometry. The larger rotating cell size samples offer a higher average negative Poisson’s ratio and a higher breaking strength due to the induced slits. The findings highlight the usefulness of patterned cuts in conventional textile materials to develop advanced auxetic textile materials with tailored geometrical and mechanical properties.
Highlights
Introduction an Auxetic Compound FabricThe textile industry is focused on the development of textiles with a negative Poisson’s ratio [1,2,3,4,5,6,7,8,9,10] at different levels of textile forms, e.g., fiber, yarn and fabric’s levels.The auxetic properties of fibers are a result of their unique structure
The results show that compound fabrics with larger rotating unit cell size exhibit a higher average negative Poisson’s ratio (NPR)
The results show clearly that a 12.5 mm rotating unit cell size auxetic compound fabric can filter particles with the average size ranging from 1 mm to 9 mm, depending on the tensile load applied to the conveyor belt
Summary
Introduction an Auxetic Compound FabricThe textile industry is focused on the development of textiles with a negative Poisson’s ratio [1,2,3,4,5,6,7,8,9,10] at different levels of textile forms, e.g., fiber, yarn and fabric’s levels.The auxetic properties of fibers are a result of their unique structure. Alderson & Evans performed the first laboratory attempt to develop auxetic fibers [1]. They developed a polymer–an ultra-high molecular weight polyethene (UHMWPE), which had a negative Poisson’s ratio (NPR) of −1.2. The polymer had a microporous node-fibril structure that consisted of a network of rectangular nodes (surface-melted powder particles) connected by freely hinged inextensible rods/fibrils. Such an arrangement was achieved by a three-stage thermal processing route with extrusion of the sintered UHMWPE rod through a die as the final stage [2]. Ravirala et al produced auxetic polyester (PES) [3,6]
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