DocumentCode :
2421868
Title :
Critical Carbon Nanotube Length in Fibers
Author :
Cornwell, C.F. ; Majure, D. ; Haskins, R. ; Lee, N.J. ; Ebeling, R. ; Maier, R. ; Marsh, C. ; Bednar, A. ; Kirgan, R. ; Welch, C.R.
Author_Institution :
US Army Res. Lab., Aberdeen Proving Ground, MD
fYear :
2008
fDate :
14-17 July 2008
Firstpage :
180
Lastpage :
186
Abstract :
The excellent mechanical properties of carbon nanotubes (CNTs), such as low density, high stiffness, and great strength make them ideal candidates for reinforcement material in a wide range of high performance materials applications. The strength-to-weight ratio of CNT fibers are anticipated to exceed any materials currently available, yet theoretical calculations indicate that they still do not take full advantage of the superior mechanical properties of the constituent CNTs. The maximum theoretical strength of CNT fibers is obtained when the shear force is equal to the intrinsic breaking strength of the constituent CNTs. Load transfer is an important factor in determining the mechanical properties of the fibers. In this paper, quenched molecular dynamics is used to study the CNT-CNT interactions in a bundle of CNTs under strain. The bundles consist of parallel (5, 5) CNTs arranged in a hexagonal closest packed (HCP) configuration with one central CNT surrounded by six CNTs on its perimeter. The simulations explore the evolution of load transfer and local strain for slipping between CNTs during the extraction of a single CNT from a bundle. The results provide insight into the role contact length plays in determining the shear stress, yield stress, and contact length needed to achieve maximum fiber strength.
Keywords :
carbon fibres; carbon nanotubes; molecular dynamics method; shear strength; yield stress; C; carbon nanotube fibers; contact length; hexagonal closest packed configuration; quenched molecular dynamics; shear force; shear stress; stiffness; yield stress; Capacitive sensors; Carbon nanotubes; Computational modeling; Computer simulation; Industrial control; Laboratories; Mechanical factors; Organic materials; Research and development; Stress;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
DoD HPCMP Users Group Conference, 2008. DOD HPCMP UGC
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-3323-0
Type :
conf
DOI :
10.1109/DoD.HPCMP.UGC.2008.75
Filename :
4755862
Link To Document :
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