On the rate dependence of mechanical properties of aligned carbon nanotube arrays

Y. C. Lu, Q. Zhang, L. Dai, J. Baur

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Aligned carbon nanotube arrays are a new form of carbon nanomaterials that have received great interest due to their superior structure and properties. The present work comprehensively examines the rate-dependent mechanical deformation of the vertically aligned carbon nanotube arrays (VA-CNTs) by the use of indentation tests. The small-displacement, elastic property of the VA-CNTs was measured by a spherical indenter. The effective indentation strain rate was varied by adjusting the indenter unloading rate. The instantaneous modulus of the VA-CNTs has been calculated and is found to increase linearly with indentation strain rate. The large-displacement, plastic property of the VA-CNTs was measured by a cylindrical, flat-ended indenter. At large indentation depths, the stress–strain curve of the VA-CNTs reveals distinct plastic deformation. The indentation strain rate was varied by directly changing the indenter velocity. The yield strength (σy) of the VA-CNTs also increases linearly with respect to indentation strain rate.

Original languageEnglish
Pages (from-to)229-242
Number of pages14
JournalMechanics of Time-Dependent Materials
Volume19
Issue number3
DOIs
StatePublished - Aug 1 2015

Bibliographical note

Publisher Copyright:
© 2015, Springer Science+Business Media Dordrecht.

Keywords

  • Aligned carbon nanotube arrays
  • Large-displacement indentation
  • Nanoindentation
  • Strain rate

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science
  • Aerospace Engineering
  • Mechanical Engineering

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