Abstract
This study intended to compare and analyze the Poisson's ratio and mechanical properties of aramid knit (ARNT), 3D printed auxetic re-entrant pattern (3DP-RE), and 2 types of composite fabrics manufactured with ARNT and 3DP-RE. Specimens were manufactured by 3D printing the re-entrant pattern with a CFDM (conveyor fused deposition modeling) 3D printer and TPU (thermoplastic polyurethane) filament, combining with aramid knit in 2 ways. Then, Poisson's ratio, bending, compression, and tensile properties were tested. As a result of Poisson's ratio, 3DP-RE and its 2 types of composite fabric showed negative Poisson's ratio at all angles and deformed stable at 0° and 90° than the bias direction. The bending strength confirmed that the composite fabric showed a lower value. But, the strain at max bending strength was greater than a substrate fabric. At the compression properties, it has been confirmed that compression strength and toughness are improved when manufacturing composite fabrics. As a result of tensile properties, 3DP-RE and composite fabrics were significantly more initial modulus, elongation and toughness than ARNT and were shown to be the largest in gradient 90°. Therefore, it is confirmed that the performance is excellent when fabricated as a 3DP-RE/ARNT composite fabric, and based on the results of studies, we intend to use it as the basic data for composite fabrics of auxetic structure suitable for shoe uppers.
Highlights
The aramid has better performance in high strength, high elasticity, high heat resistance, dimensional stability, and insulating properties than other fibers
Tensile property of aramid knit, 3D printed auxetic re‐entrant pattern and its two‐types of composite fabrics by tilting angles This study have identified the tensile properties of the aramid knit, the 3D printed auxetic re-entrant pattern, and the 2 types of 3D printed auxetic re-entrant/aramid knit composite fabric by tilting angles
In the results of the bending property, there is no significant difference in bending strength by tilting angles of ARNTn, and the bending strength of 3D printed auxetic re-entrant pattern (3DP-RE)-n and 3DP-RE-n/aramid knit (ARNT)-n increased as tilting angles increased
Summary
The aramid has better performance in high strength, high elasticity, high heat resistance, dimensional stability, and insulating properties than other fibers. It’s applied to safety equipments such as foot wear, gloves and socks in the fields of defense and firefighting, in various forms such as yarn, fabric, non0woven fabric, and knit. Such aramid is broadly divided into m-Aramid and p-Aramid. That require heat resistance, anti-inflammatory, friction resistance, etc., while the p-Aramid is mainly used for bulletproof clothing, firefighting uniforms, safety shoes, safety helmets, etc. To improve the properties of such aramid-based materials, researches are underway to improve shock absorption as a protective material by manufacturing them in composite fabrics along with rubber and polyurethane-based materials (Roy et al, 2018; Wang et al, 2020)
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