In-Plane Behavior of Auxetic Non-Woven Fabric Based on Rotating Square Unit Geometry under Tensile Load

Abstract

This paper reports the auxetic behavior of modified conventional non-woven fabric. The auxetic behavior of fabric was achieved by forming rotating square unit geometry with a highly ordered pattern of slits by laser cutting. Two commercial needle-punched non-woven fabric used as lining and the reinforcement fabric for the footwear industry were investigated. The influence of two rotating square unit sizes was analyzed for each fabric. The original and modified fabric samples were subjected to quasi-static tensile load by using the Tinius Olsen testing machine to observe the in-plane mechanical properties and deformation behavior of tested samples. The tests were recorded with a full high-definition (HD) digital camera and the video recognition technique was applied to determine the Poisson’s ratio evolution during testing. The results show that the modified samples exhibit a much lower breaking force due to induced slits, which in turn limits the application of such modified fabric to low tensile loads. The samples with smaller rotating cell sizes exhibit the highest negative Poisson’s ratio during tensile loading through the entire longitudinal strain range until rupture. Non-woven fabric with equal distribution and orientation of fibers in both directions offer better auxetic response with a smaller out-of-plane rotation of rotating unit cells. The out-of-plane rotation of unit cells in non-homogenous samples is higher in machine direction.

In-Plane Deformation Behavior and the Open Area of Rotating Squares in an Auxetic Compound Fabric

“…In our previous research [ 33 ], the auxetic behavior of modified conventional non-woven fabrics based on the rotating rigid unit cell geometry was investigated. We found that non-woven samples with smaller rotating cell sizes exhibited the highest negative Poisson’s ratio.…”

Towards textile metamaterials: a pathway to auxeticity and tensegrity in a needle-punched nonwoven stiff felt

“…46,47 Extending the auxetic behavior of needlepunched nonwovens, work by Dubrovski et al have produced in-plane auxeticity in needlepunched nonwovens by using laser cutting to produce a rotating square pattern in the fabric. 48 This paper builds on what is known about auxetic nonwovens by examining the auxetic character of a stiff felt nonwoven. This type of nonwoven is of interest since its network 5 structure includes elements of more than one type of auxetic nonwoven, and therefore, its auxeticity could result from multiple mechanisms.…”

“…46,47 Extending the auxetic behavior of needle-punched nonwovens, work by Dubrovski et al have produced in-plane auxeticity in needle-punched nonwovens by using laser cutting to produce a rotating square pattern in the fabric. 48…”

A Study of Woven Fabrics Made of Helical Auxetic Yarns

“…In textiles, many researchers have discovered the auxetic behaviour from fibre [9][10][11] to fabric using different materials and structures. Auxetic fabrics can be made using conventional textile technologies including weaving [12,13], knitting [14][15][16], braiding [17,18] and nonwoven [19][20][21]. Auxetic woven fabrics attracted many researchers in recent years due to their integrated structure and dimensionally stable properties compared with other fabrics [22].…”