Wearable strain sensors play a pivotal role in real-time human motion detection and health monitoring. Traditional fabric-based sensors, typically with positive Poisson's ratio, face challenges maintaining sensitivity comfort during due to conflicting resistance changes different directions. In this work, high-performance stretchable are developed based on graphene-modified auxetic fabrics (GMAF) for smart wearable devices. The proposed GMAF negative ratio achieved through commercially...

This paper reports a novel method to fabricate auxetic warp knitted fabrics on tricot knitting machine based special structure design and process. Three structures were successfully developed all of them designed form reentrant hexagonal geometry acquire an effect. To provide the with frames, elastomeric yarns stiff used elastic underlaps underlaps, respectively. While can keep stable, support their frames. alleviate transfer in loops under tension, additional front yarn guide bar was feed...

As a clean and sustainable energy storage technology, zinc-air batteries (ZABs) offer significant potential for future applications. However, the development of efficient, stable, cost-effective non-precious metal catalysts the...

Auxetic woven fabrics made with special geometrical structures have gained the interest of textile scientists in recent years. This paper reports a study on auxetic fabric based double-directional parallel in-phase zig-zag foldable structure. Such has been already produced and investigated for its negative Poisson's ratio effect two principal directions (weft warp directions). However, biased tensile as well under repeated loading conditions not studied yet. Therefore, this paper, these...

This paper reports a geometrical analysis of auxetic woven fabrics based on foldable geometry. Two having different parameters were first designed and fabricated then subjected to tensile tests in two principal directions. Based the experimental observations geometry one fabric structural unit cell at strains, model was proposed relationship between Poisson’s ratio strain established for each direction. semi-empirical equations are subsequently obtained both directions by fitting...

Warp knitting technology is a fabric-forming technologies that very suitable to fabricate three-dimensional (3D) auxetic fabrics due its high efficiency and powerful pattern designing possibilities. In this study, two typical geometries, namely the re-entrant hexagonal network rotating square solids, were selected as design prototypes for manufacture of 3D warp-knitted spacer fabrics. While fabric structures with representative units different sizes designed based on geometry manufactured by...

The compressive properties and failure mode of multi-layer carbon woven/epoxy resin composites with various nanotube (CNT) contents at quasi-static high strain rates loading have been investigated in the present paper. results indicate that stress–strain curves are rate sensitive, stiffness stress CNT significantly influenced by content. modes woven without CNTs tend to be shear deformation, delamination fiber breakage matrix cracking, higher mainly delamination, cracking deformation.

In our previous study, a novel class of auxetic warp knitted fabrics were developed and their behaviors studied under single tensile test. However, during daily use, the are usually subjected to repeating tension rather than tension. Therefore, durability fabrics’ performance is great importance. So far, behavior has not systematically been investigated. this paper, we report study on All fabric samples test within strain 25% until 100 cycles. The results show that can keep effect in both...

A series of auxetic warp knitted fabrics based on reentrant geometry were developed in our previous study and their Poisson's ratio the wale direction course can be as low −0.5 −0.15, respectively. However, quantitative relationships between structural parameters effect, which offer a guide to design manufacture process, are still unknown. Herein, aim is find such relationships. Based geometrical analysis, two semiempirical equations tensile strain established when stretched direction, The...

Auxetic fabrics are those with a negative Poisson's ratio and have received increasing attention in recent years. In our previous study, series of auxetic warp‐knitted were developed based on re‐entrant geometry their effects experimentally investigated. Unlike weft‐knitted fabrics, the preparation production process very complicated time consuming. However, finite element (FE) method offers an efficient way to simulate predict behavior without conducting manufacturing experimental tests....

Abstract. It is crucial to fully master the mechanical properties of building components for ensuring safety infrastructures during service. The laboratory deformation test an important way study components. At present, there still a lack combination high-efficiency, high-accuracy, and low-cost measurement methods tests. To address issue, method proposed measure by using structured light technique in this paper. applied axial tensile dog-bone specimen, 3D full-field displacement specimen...

Using a HoloEye SLM (spatial light modulator) as multi-level phase modulator, the diffractive optical elements can be programmed onto reflective Liquid Crystal on Silicon (LCoS) display so that dynamic displays may performed. A MATLAB program is written to produce DOE, while FRESNEL software used confirm elements.