Elastic–Plastic Behaviors of Vertically Aligned Carbon Nanotube Arrays by Large-Displacement Indentation Test

  • Y. Charles Lu
  • Johnson Joseph
  • Qiuhong Zhang
  • Feng Du
  • Liming Dai
Part of the Solid Mechanics and Its Applications book series (SMIA, volume 203)


This chapter describes the large-displacement indentation test method for examining elastic–plastic behaviors of vertically aligned carbon nanotube arrays (VA-CNTs). The principle of this test is explained by using a cavity expansion model. The experiments have been performed on VA-CNTs synthesized by the chemical vapor deposition (CVD) method. Under a cylindrical, flat indenter, the VA-CNTs exhibit two distinct deformation stages: a short, elastic deformation at small displacement and a plateau-like, plastic deformation at large displacement. The critical indentation stress, a measure of yield stress or collapsing stress of the VA-CNT arrays, has been obtained. The deformation mechanism of the VA-CNTs at large displacement is revealed with scanning electronic microscope (SEM) images of the deformed VA-CNTs and finite element simulations.


Large Displacement Solid Polymer Equivalent Plastic Strain Plastic Collapse Indentation Stress 
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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Y. Charles Lu
    • 1
  • Johnson Joseph
    • 1
  • Qiuhong Zhang
    • 2
  • Feng Du
    • 3
  • Liming Dai
    • 3
  1. 1.Department of Mechanical EngineeringUniversity of KentuckyLexingtonUSA
  2. 2.University of Dayton Research InstituteUniversity of DaytonDaytonUSA
  3. 3.Department of Macromolecular Science and EngineeringCase Western Reverse UniversityClevelandUSA

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