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000202903 001__ 202903 000202903 005__ 20181203023642.0 000202903 0247_ $$2doi$$a10.1016/j.actamat.2010.07.054 000202903 022__ $$a1359-6454 000202903 037__ $$aARTICLE 000202903 245__ $$aOptimizing load transfer in multiwall nanotubes through interwall coupling: Theory and simulation 000202903 260__ $$c2010 000202903 269__ $$a2010 000202903 336__ $$aJournal Articles 000202903 520__ $$aAn analytical model is developed to determine the length scales over which load is transferred from outer to inner walls of multiwall carbon nanotubes (MWCNTs) as a function of the amount of bonding between walls. The model predicts that the characteristic length for load transfer scales as l similar to t root E/(mu) over bar, where t is the CNT wall spacing, E is the effective wall Young's modulus, and (mu) over bar is the average interwall shear modulus due to interwall coupling. Molecular dynamics simulations for MWCNTs with up to six walls, and with interwall coupling achieved by interwall sp(3) bonding at various densities, provide data against which the model is tested. For interwall bonding having a uniform axial distribution, the analytic and simulation models agree well, showing that continuum mechanics concepts apply down to the atomic scale in this problem. The simulation models show, however, that load transfer is sensitive to natural statistical fluctuations in the spatial distribution of the interwall bonding between pairs of walls, and such fluctuations generally increase the net load transfer length needed to fully load an MWCNT. Optimal load transfer is achieved when bonding is uniformly distributed axially, and all interwall regions have the same shear stiffness, implying a linear decrease in the number of interwall bonds with distance from the outer wall. Optimal load transfer into an n-wall MWCNT is shown to occur over a length of similar to 1.5nl. The model can be used to design MWCNTs for structural materials, and to interpret load transfer characteristics deduced from experiments on individual MWCNTs. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. 000202903 6531_ $$acarbon nanotubes 000202903 6531_ $$aenergy 000202903 6531_ $$agraphite 000202903 6531_ $$aInterwall bonding 000202903 6531_ $$aLoad 000202903 6531_ $$amolecular-dynamics 000202903 6531_ $$aMulti-wall carbon nanotube 000202903 6531_ $$aNanocomposite 000202903 6531_ $$aropes 000202903 6531_ $$astrength 000202903 6531_ $$atransfer 000202903 700__ $$aByrne, E. M. 000202903 700__ $$aLetertre, A. 000202903 700__ $$aMcCarthy, M. A. 000202903 700__ $$0246474$$aCurtin, W. A.$$g211624 000202903 700__ $$aXia, Z. 000202903 773__ $$j58$$q6324-6333$$tActa Materialia 000202903 909C0 $$0252513$$pLAMMM$$xU12614 000202903 909CO $$ooai:infoscience.tind.io:202903$$pSTI$$particle 000202903 937__ $$aEPFL-ARTICLE-202903 000202903 970__ $$abyrne_optimizing_2010/LAMMM 000202903 973__ $$aOTHER$$rREVIEWED$$sPUBLISHED 000202903 980__ $$aARTICLE