Large-Displacement Indentation Testing of Vertically Aligned Carbon Nanotube Arrays

Y. C. Lu, J. Joseph, Q. Zhang, M. R. Maschmann, L. Dai, J. Baur

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Mechanical properties and deformation of the vertically aligned carbon nanotube arrays (VA-CNTs) has been examined with large-displacement indentation tests inside a scanning electronic microscope (SEM). The in-situ indentation allows for establishment of the load-depth responses and real-time observations of the deformation processes. Under a cylindrical, flat indenter, the VA-CNTs exhibit elastic deformation at small displacement and then plastic deformation at large displacement. The critical indentation pressure (Pm), a measure of collapsing stress of the CNT arrays, is obtained. The magnitude of Pm is approximately equal to the collapsing stress of the carbon nanotube arrays obtained under uniaxial compression.

Original languageEnglish
Pages (from-to)1551-1554
Number of pages4
JournalExperimental Mechanics
Volume52
Issue number9
DOIs
StatePublished - Nov 2012

Keywords

  • Indentation
  • Large deformation
  • Vertically aligned carbon nanotubes

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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