The tip-sample interaction is modeled in the same fashion, with nonlinear ki and bi . The sample is moved slowly towards the tip with speed V . Energy dissipation is accomplished by means of a dashpot. DMT mechanics is most appropriate for rigid systems, low work of adhesion and small radii of curvature. BCP is the intermediate case, for moderately stiff systems.
Energy dissipation is modeled by a dashpot only.
The contact geometry is allowed to be severly deformed. JKRS mechanics is best for comliant systems, large work of adhesion and large radii of curvature. This attractive force remains, in principle, to infinite separation of tip and sample. A viscous damping force has been added to the simulation to model the energy dissipation of the fluid. The ratio rat2 is defined as the ratio of the damping coefficients of the fluid and the cantilever.