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Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, Volume 2 pp 101–107Cite as

Rate-Dependent, Large-Displacement Deformation of Vertically Aligned Carbon Nanotube Arrays

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Abstract

Rate dependent mechanical response of the vertically aligned carbon nanotube arrays (VA-CNTs) has been examined with large-displacement indentation tests. The VA-CNTs are observed to exhibit elastic deformation at small displacement and then plastic deformation at large displacement. Under the cylindrical, flat-ended punch, the nanotube arrays collapse plastically at positions of immediately beneath the indenter face. The plastic zone remains stable at large displacement, because the stress/strain field under a flat cylindrical punch is relatively constant. From the normalized indentation stress-displacement curve, the critical indentation pressure (Pm), a measure of collapsing stress of the CNT arrays, is obtained. The speeds of the indenter have been varied, from 0.5 to 4 μm/s. The large displacement deformation is influenced by the effective strain rate of the material. The critical indentation pressure increases with the increase with the strain rates.

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, University of Kentucky, Lexington, KY, 40506, USA

    Y. C. Lu & J. Joseph

  2. Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXBC, Wright-Patterson AFB, OH, 45433, USA

    M. R. Maschmann & J. Baur

  3. Universal Technology Corporation, Dayton, OH, 45432, USA

    M. R. Maschmann

  4. Department of Chemical Engineering, Case Western University, Cleveland, OH, 44106, USA

    L. Dai

Authors
  1. Y. C. Lu
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  2. J. Joseph
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  3. M. R. Maschmann
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  4. L. Dai
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  5. J. Baur
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Corresponding author

Correspondence to Y. C. Lu .

Editor information

Editors and Affiliations

  1. Sandia National Laboratories, Livermore, 94550, USA

    Bonnie Antoun

  2. University of Colorado, Boulder, 80309-0430, USA

    H. Jerry Qi

  3. AirForce Research Laboratory, Wright-Patterson Air Force Base, 45433, USA

    Richard Hall

  4. University of Dayton Research Institute, Dayton, 45469-0101, USA

    G.P. Tandon

  5. University of Texas-Dallas, Dallas, 75080, USA

    Hongbing Lu

  6. University of Kentucky, Paducah, 42002, USA

    Charles Lu

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© 2013 The Society for Experimental Mechanics

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Lu, Y.C., Joseph, J., Maschmann, M.R., Dai, L., Baur, J. (2013). Rate-Dependent, Large-Displacement Deformation of Vertically Aligned Carbon Nanotube Arrays. In: Antoun, B., Qi, H., Hall, R., Tandon, G., Lu, H., Lu, C. (eds) Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4241-7_15

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  • DOI: https://doi.org/10.1007/978-1-4614-4241-7_15

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  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4614-4240-0

  • Online ISBN: 978-1-4614-4241-7

  • eBook Packages: EngineeringEngineering (R0)

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