Schematic of the DWCNT model subjected to axial pressure for analysis. The left image displays the latitudinal cross-section, which shows the vdW force between the inner and outer tubes. The right image displays the longitudinal cross-section, which shows the axial pressure acting on both ends of the DWCNT.
Lei et al. Nanoscale Research Letters 2011 6:492 doi:10.1186/1556-276X-6-492