Figure 3.

Simulation model and definitions for (a) bond angles and bond lengths of (8,0) BNNT are shown. Bonds parallel to axial are shown as Bond-II, and other ones slanted to the axial are shown as Bond-I. Bond angles are labeled as A, B, C, and D. Variation of (b) the radial buckling and bond lengths of (8,0) BNNT at different strains and (c) the radial buckling and bond angles of (8,0) BNNT at different strains.