A theoretical analysis of deformation behavior of auxetic plied yarn structure

2018 ◽  
Vol 27 (7) ◽  
pp. 075003 ◽  
Author(s):  
Jifang Zeng ◽  
Hong Hu
Keyword(s):  
Theoretical Analysis ◽  
Deformation Behavior ◽  
Yarn Structure ◽  
Plied Yarn

All-carbon cord-yarn supercapacitor

2017 ◽  
Vol 48 (5) ◽  
pp. 875-883 ◽  
Author(s):  
Yuxiang Huang ◽  
Jonathan Y Chen
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Activated Carbon Fiber ◽  
Electrical Impedance Spectroscopy ◽  
Cord Yarn ◽  
Spun Yarn ◽  
Yarn Structure ◽  
Plied Yarn ◽  
Specific Length ◽  
Better Than

Flexible solid-state yarn supercapacitors were fabricated using commercial carbon fiber and activated carbon fiber. Two methods of yarn construction were studied. One was twisting carbon fiber and activated carbon fiber together (plied yarn), and the other was wrapping activated carbon fiber on carbon fiber (wrapped yarn). Electrochemical measurements in terms of cyclic voltammetry (CV), galvanostatic charge/discharge (GC) and electrical impedance spectroscopy (EIS) were conducted. The result revealed that the cord-yarn structure performed better than the core-spun yarn structure, by showing a specific length capacitance of 82 mF cm−1 at 2 mVs−1. It also exhibited a high specific length energy density of 20.4 μW h cm−1 at a power density of 60 μW cm−1. There was little capacitance reduction when the cord-yarn supercapacitor was bent or crumpled, showing an excellent mechanical flexibility.

scholarly journals Effect of Different Yarn Combinations on Auxetic Properties of Plied Yarns

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mine Akgun ◽  
Recep Eren ◽  
Fatih Suvari ◽  
Tugba Yurdakul
Keyword(s):  
Polyvinyl Chloride ◽  
Poisson’S Ratio ◽  
Tensile Modulus ◽  
Experimental Results ◽  
Poisson's Ratio ◽  
Yarn Twist ◽  
Twist Level ◽  
Negative Poisson's Ratio ◽  
Yarn Structure ◽  
Plied Yarn

Abstract This study presents the effects of a novel plied yarn structure consisting of different yarn components and yarn twist levels on the Poisson's ratio and auxetic behavior of yarns. The plied yarn structures are formed with bulky and soft yarn components (helical plied yarn [HPY], braided yarn, and monofilament latex yarn) and stiff yarn components (such as high tenacity [HT] and polyvinyl chloride [PVC]-coated polyester yarns) to achieve auxetic behavior. Experimental results showed that as the level of yarn twist increased, the Poisson's ratios and the tensile modulus values of the plied yarns decreased, but the elongation values increased. A negative Poisson's ratio (NPR) was obtained in HT–latex and PVC–latex plied yarns with a low twist level. The plied yarns formed with braid–HPY and braid–braid components gave partial NPR under tension. A similar result was achieved for yarns with HT–latex and PVC–latex components. Since partial NPR was seen in novel plied yarns with braided and HPY components, it is concluded that yarns formed with bulky–bulky yarn components could give an auxetic performance under tension.

Finite element simulation of an auxetic plied yarn structure

2018 ◽  
Vol 89 (16) ◽  
pp. 3394-3400 ◽  
Author(s):  
Jifang Zeng ◽  
Haijian Cao ◽  
Hong Hu
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Structural Parameters ◽  
Analytical Data ◽  
Tensile Modulus ◽  
Element Model ◽  
Element Simulation ◽  
Two Factors ◽  
Yarn Structure ◽  
Plied Yarn

Auxetic plied yarn is a novel type of yarn structure formed with two types of component yarns with different moduli. Although the effect of structural parameters on its negative Poisson's ratio behavior has been investigated by both experimental and geometrical analyses, the influence of material properties, including yarn tensile modulus and friction, has not been studied yet. In this work, these two factors are further investigated via finite element simulation. The finite element model is first created by using the commercial software ANSYS 15.0. Then, the simulation results are compared with the experimental and analytical data. Finally, the effects of the tilt angle of stiff yarn, yarn friction and tensile modulus are discussed. It is expected that the outcomes of this work would be useful to guide the design and fabrication of this type of auxetic yarn structure.

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