  A new mesoscale mechanical model, describing elastic interactions in carbon
nanotubes (CNT) and other nanofilaments, is proposed. Functional form of the
developed model is based on enhanced vector model (EVM) that describes basic
types of bond deformations: tension, torsion, bending and shear. Calibration of
bond stiffnesses is performed by adjusting EVM parameters to reproduce both
CNT's deformation energies and shape observed in a full-atomistic simulation.
The parameters obtained are compared with the ones obtained from
Euler-Bernoulli beam theory considerations. It is found that after certain
critical length of a tested CNT specimen its stiffness parameters become
length-independent and can be used in mesoscale simulations of CNTs of
arbitrary length.
