LAUSR

The finite element method is used here to study the elastic properties of concentric boron nitride and carbon multi-walled nanotubes. Beam and spring elements are, respectively, employed to model the covalent bonds between atoms and nonbonding van der Waals interactions between atoms located on different walls. The double-walled and triple-walled nanotubes with different arrangements of boron nitride and carbon nanotubes are considered. It is shown that the elastic modulus of the concentric multi-walled BN and C nanotubes increases by increasing the ratio of nanotube length to its diameter (aspect ratio). In addition, the effect of aspect ratio on the elastic modulus of the armchair nanotubes is larger than that on the elastic modulus of the armchair nanotubes. Comparing the elastic modulus of the double-walled and triple-walled nanotubes, it is observed that the effect of number of walls on the elastic modulus of the concentric boron nitride and carbon multi-walled nanotube is negligible.