... lengths of (5,5) BNNT are shown. Bonds normal toaxial are shown as Bond-III, and other ones slanted to the axial are shown as Bond-IV. Bond angles are labeled as E, F, G, and H.Variation of (b) the ... 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) BNNTat ... under the larger strain. However, the BO of the B-N bond parallel to the axial becomes smaller at larger strains. The increase and decrease in the BO values f or the slanted and parallel bonds...