  Recently, tribologists have shown increasing interest in rate-dependent
phenomena occurring in viscoelastic fractures. However, in some cases,
conflicting results are obtained despite the use of similar theoretical models.
For this reason, we try to shed light on the effects that long and short-range
adhesion has on the pull-off force in the contact of viscoelastic media by
exploiting a recently developed numerical model. We find that, in the limit of
long-range adhesion, the unloading velocity has little effect on the pull-off
force, which is close to the value predicted by Bradley for rigid bodies. In
such case, the detachment process is characterized by a uniform bond-breaking
of the contact area, and viscous dissipation involves the bulk material. For
medium(short)-range adhesion, the pull-off force is instead a monotonic
increasing function of the pulling velocity and, at high speeds, reaches a
plateau that is a function of the adiabatic surface energy. In this case, the
detachment process is similar to the opening of a circular crack, and viscous
dissipation is localized at the contact edge.
