Load Transfer Issues in the Tensile and Compressive Behavior of Multiwall Carbon Nanotubes
Document Type Article
Published in Published in Materials Science and Engineering: A 429:1-2 (August 15, 2006), pp. 66-73; doi: 10.1016/j.msea.2006.04.110 Copyright © 2006 Elsevier B.V. Used by permission. Online at http://www.elsevier.com/locate/msea
Carbon nanotubes (CNT) are considered to be ultra strong and stiff reinforcements for structural composite applica¬tions. The load transfer between the inner and outer nanotubes in multiwall carbon nanotubes (MWCNT) has to be clearly understood to realize their potential in not only composites, but also other applications such as nano-springs and nano-bearings. In this paper, we study the load transfer between the walls of multiwall nanotubes both in tension and compression using molecular dynamics simulations. It is found that very minimal load is transferred to the in¬ner nanotube during tension. The load transfer in compression of capped nanotubes is much greater than that in ten¬sion. In the case of uncapped nanotubes, the inner nanotube is deformed in bending, only after the outer nanotube is extensively deformed by buckling. It is found that the presence of a few interstitial atoms between the walls of mul¬tiwall nanotube can improve the stiffness and enhance the load transfer to the inner nanotubes both in tension and compression.