A Numerical Study on the Dynamic Tensile Behavior of Helical Auxetic Yarns

DAI Jintao; WANG Wenqiang

doi:10.11858/gywlxb.20200570

Volume 35 Issue 2

Mar 2021

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Chinese Journal of High Pressure Physics > 2021 > 35(2): 024204.

DAI Jintao, WANG Wenqiang. A Numerical Study on the Dynamic Tensile Behavior of Helical Auxetic Yarns[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024204. doi: 10.11858/gywlxb.20200570

Citation:

DAI Jintao, WANG Wenqiang. A Numerical Study on the Dynamic Tensile Behavior of Helical Auxetic Yarns[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024204. doi: 10.11858/gywlxb.20200570

DAI Jintao, WANG Wenqiang. A Numerical Study on the Dynamic Tensile Behavior of Helical Auxetic Yarns[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024204. doi: 10.11858/gywlxb.20200570

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A Numerical Study on the Dynamic Tensile Behavior of Helical Auxetic Yarns

doi: 10.11858/gywlxb.20200570

DAI Jintao,
WANG Wenqiang^{*
,
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Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 18 Jun 2020
Rev Recd Date: 25 Aug 2020

Abstract

Abstract

A helical auxetic yarn (HAY) is a composite yarn which is formed by helically wrapping a high modulus yarn on a low modulus yarn, and it exhibits the so-called negative Poisson’s ratio phenomenon of transverse expansion upon longitudinal stretching. To reveal the mechanisms of HAY’s shock resistance, a study on its dynamic tensile behavior was carried out based on finite element simulation. It was found that there are two stress waves in a shock loaded HAY, one is a fast wave and another is a slow wave which are dominated respectively by the wrap yarn and the core yarn, and between the two wavefronts, both the transverse deformation and the Mises stress change periodically with time and space. The relationships between the wave speeds and loading velocity and friction coefficient are presented and qualitatively discussed based on the concept of effective modulus. The simulation results also show that the internal energy is almost equal to the kinetic energy, and friction has a significant contribution to energy absorption.
- helical auxetic yarn,
- negative poisson’s ratio,
- shock response,
- stress wave,
- finite element simulation

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References

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A Numerical Study on the Dynamic Tensile Behavior of Helical Auxetic Yarns

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