Time-dependent microstructural evolution mechanisms of twisted carbon nanotube fibers under tension and relaxation

Xiao Xue, Pengfei Wang, Ming Gong, Jie Tian, Yu Qiao, Junfang Shan, Gengzhi Sun, Guangfa Gao, Songlin Xu

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Carbon nanotube (CNT) fibers are inevitably subject to severe plastic deformation under complex loading conditions while applying in wearable electronics. In this work, we uncover the time-dependent structure evolution mechanism of twisted CNT fibers by a series of continuous and discontinuous loading experiments. The results reveal that the highly twisted CNT fibers are more sensitive to strain rate and have large stress attenuation during the relaxation process. The in-situ tensile test under scanning electron microscope (SEM) indicates that the twisting angles of CNT fiber decreased during the stretching and relaxation due to the slippage and rearrangement of CNTs. An unsteady ternary model is developed to describe the stress relaxation behavior of twisted CNT fibers taking strain rate effect and the time dependence of viscosity into account; then the constitutive equations are mathematically derived and analyzed. We believe that this work would provide beneficial guidance for designing twisted CNT fiber with high reliability and durability.

Original languageEnglish
Article number102866
JournalInternational Journal of Plasticity
Volume136
DOIs
StatePublished - Jan 2021

Keywords

  • CNT fiber
  • In-situ SEM
  • Stress relaxation
  • Time-dependent effect
  • Unsteady ternary model

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