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(Color online) Morphological changes for a (8, 3) nanotube under torsion.
(Color online) Sthear stress vs shear strain. Note that the curves for chiral tubes are asymmetric about zero strain.
(Color online) (a) Critical buckling shear strains and (b) the quantity as function of tube chirality for SWCNTs with approximately the same diameters. Some additional data for SWCNTs with slightly larger or smaller diameters are also presented for reference. Special attentions should be paid to that (1) the maximum difference between the critical buckling strains of two loading directions may be up to 85%; and (2) for a given tube diameter, a SWCNT with a chiral angle of about 10° possesses the best torsional stability in the twisting direction, while a SWCNT with a chiral angle of about 18° has the lowest torsional stability in the untwisting direction.
(Color online) Critical buckling shear strains as function of tube diameter.
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