  A new model for computer simulation of solids, composed of bonded rigid body
particles, is proposed. Vectors rigidly connected with particles are used for
description of deformation of a single bond. The expression for potential
energy of the bond and corresponding expressions for forces and moments are
proposed. Formulas, connecting parameters of the model with longitudinal,
shear, bending and torsional stiffnesses of the bond, are derived. It is shown
that the model allows to describe any values of the bond stiffnesses exactly.
Two different calibration procedures depending on bond length/thickness ratio
are proposed. It is shown that parameters of model can be chosen so that under
small deformations the bond is equivalent to either Bernoulli-Euler rod or
Timoshenko rod or short cylinder connecting particles. Simple expressions,
connecting parameters of V-model with geometrical and mechanical
characteristics of the bond, are derived. Computer simulation of dynamical
buckling of the straight discrete rod and half-spherical shell is carried out.
