Deformation behavior of auxetic woven fabric based on re-entrant hexagonal geometry in different tensile directions

Abstract

Auxetic woven fabrics made of non-auxetic yarns have gained the interest of textile scientists in recent times. Such fabrics have already been produced and investigated for their negative Poisson's ratio (NPR) effect in two principle directions. However, the NPR effect of these fabrics in different biased tensile directions has not been studied. In particular, the influence of repeated tensile loading on the NPR effect retention ability of fabric has not been explored yet. Therefore, this paper aims to report the NPR effect of auxetic woven fabric in different tensile directions and the influence of repeating tensile cycle tests on its NPR effect retention ability. The auxetic woven fabric is firstly fabricated based on a re-entrant hexagonal geometrical structure by using elastic and non-elastic yarns, and then subjected to single and repeating tensile tests in five different tensile directions, which include two principle directions and three biased directions. It is found that the NPR effect is largely dependent upon the tensile direction and the number of repeating tensile cycles.

Single‐ and Double‐Layered Bistretch Auxetic Woven Fabrics Made of Nonauxetic Yarns Based on Foldable Geometries

“…These properties include shear modulus, energy absorbance, vibration damping, [5][6][7][8][9] sound absorption, [10] indentation resistance, [11][12][13] and synclastic behavior for better formability. [14] The known naturally and manmade auxetic materials include metals, [15] laminates, [16] gels, [17] crystalline structures, [18][19][20] polymers, [21,22] composites, [6,8,23] foams, [1,24] and textile materials including fibers, [22,25] yarns, [26][27][28][29][30] and fabrics including woven fabrics, [26,27,[31][32][33][34][35][36][37] weft-knitted fabrics, [38][39][40][41][42][43] warp-knitted fabrics, [44][45][46]…”

“…[55] Similarly, it is proposed that the structural modification can lead to crystal structures exhibiting auxetic behavior. [56,57] Among auxetic textile materials, auxetic woven fabrics produced by applying the technique of structural modification and made of nonauxetic yarns [31][32][33][34][35] have gained extraordinary interest of researchers in modern times. The conventional woven fabrics have a positive PR which means that they undergo contraction in transverse direction upon stretch in the longitude direction.…”

“…[34,60] Conversely, the auxetic woven fabrics possess NPR, and they become wider in the lateral direction as well when stretched in the longitude direction. [31][32][33][34][35] Therefore, in case of a garment made of auxetic woven fabric, the deformation of the fabric is consistent with body movements, resulting in improved comfort and shape fitting. [14,34,61] Most commonly, two techniques have been adopted to produce auxetic woven fabrics.…”

“…[58] Previously, this technique was used to produce auxetic knitted fabrics and recently was used for the development of single-layered and double-layered unistretch and bistretch auxetic woven fabrics. [31][32][33][34][35] The developed auxetic-knitted fabrics based on this technique are mostly produced on a laboratory scale because of complicated geometrical structures. In addition, limitations such as low structural stability, low elastic recovery, and higher thickness restricted their use in many applications.…”

“…[34] Most recently, the development of single-layered bistretch auxetic woven fabrics based on foldable geometry and re-entrant hexagonal geometry using this technique has also been reported. [31][32][33]35] These fabrics which have extensibility and auxetic behavior in both principal directions are named as bistretch auxetic woven fabrics. These fabrics showed a larger auxetic behavior when stretched along both warp and weft directions.…”