Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays

Y. C. Lu; J. Joseph; M. R. Maschmann; L. Dai; J. Baur

doi:10.1007/978-1-4614-4241-7_15

Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays

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

Mechanical and Aerospace Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

3 Scopus citations

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 (P_m), 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.

Original language	English
Title of host publication	Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials - Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics
Pages	101-107
Number of pages	7
DOIs	https://doi.org/10.1007/978-1-4614-4241-7_15
State	Published - 2013
Event	2012 Annual Conference on Experimental and Applied Mechanics - Costa Mesa, CA, United States Duration: Jun 11 2012 → Jun 14 2012

Publication series

Name	Conference Proceedings of the Society for Experimental Mechanics Series
Volume	2
ISSN (Print)	2191-5644
ISSN (Electronic)	2191-5652

Conference

Conference	2012 Annual Conference on Experimental and Applied Mechanics
Country/Territory	United States
City	Costa Mesa, CA
Period	6/11/12 → 6/14/12

Keywords

Carbon nanotube
Indentation
Large displacement
Strain rate

ASJC Scopus subject areas

General Engineering
Computational Mechanics
Mechanical Engineering

Access to Document

10.1007/978-1-4614-4241-7_15

Cite this

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 Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials - Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics (pp. 101-107). (Conference Proceedings of the Society for Experimental Mechanics Series; Vol. 2). https://doi.org/10.1007/978-1-4614-4241-7_15

Lu, Y. C. ; Joseph, J. ; Maschmann, M. R. et al. / Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays. Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials - Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics. 2013. pp. 101-107 (Conference Proceedings of the Society for Experimental Mechanics Series).

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title = "Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays",

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 = "Lu, {Y. C.} and J. Joseph and Maschmann, {M. R.} and L. Dai and J. Baur",

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booktitle = "Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials - Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics",

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Lu, YC, Joseph, J, Maschmann, MR, Dai, L & Baur, J 2013, Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays. in Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials - Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics. Conference Proceedings of the Society for Experimental Mechanics Series, vol. 2, pp. 101-107, 2012 Annual Conference on Experimental and Applied Mechanics, Costa Mesa, CA, United States, 6/11/12. https://doi.org/10.1007/978-1-4614-4241-7_15

Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays. / Lu, Y. C.; Joseph, J.; Maschmann, M. R. et al.
Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials - Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics. 2013. p. 101-107 (Conference Proceedings of the Society for Experimental Mechanics Series; Vol. 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Lu, Y. C.

AU - Joseph, J.

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AU - Dai, L.

AU - Baur, J.

PY - 2013

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N2 - 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.

AB - 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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Lu YC, Joseph J, Maschmann MR, Dai L, Baur J. Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays. In Challenges in Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials - Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics. 2013. p. 101-107. (Conference Proceedings of the Society for Experimental Mechanics Series). doi: 10.1007/978-1-4614-4241-7_15

Rate-dependent, large-displacement deformation of vertically aligned carbon nanotube arrays

Abstract

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Conference

Keywords

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