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

1
Institute of Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, Maribor 2000, Slovenia
2
Mechanical Engineering Research Institute, Faculty of Mechanical Engineering, University of Maribor, Maribor 2000, Slovenia
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(6), 1040; https://doi.org/10.3390/polym11061040
Received: 10 May 2019 / Revised: 3 June 2019 / Accepted: 10 June 2019 / Published: 12 June 2019
(This article belongs to the Special Issue Innovative Functional Textiles)
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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. View Full-Text
Keywords: auxetic polymer materials; needle-punched non-woven fabric; rotating square unit geometry; mechanical properties; tensile load; Poisson’s ratio auxetic polymer materials; needle-punched non-woven fabric; rotating square unit geometry; mechanical properties; tensile load; Poisson’s ratio
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Dobnik Dubrovski, P.; Novak, N.; Borovinšek, M.; Vesenjak, M.; Ren, Z. In-Plane Behavior of Auxetic Non-Woven Fabric Based on Rotating Square Unit Geometry under Tensile Load. Polymers 2019, 11, 1040.

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