Summary: Interaction and Deformation of Viscoelastic Particles. 2.
Ian Wark Research Institute, University of South Australia, Mawson Lakes SA 5095, Australia
Received January 16, 2001. In Final Form: April 30, 2001
Analyzed is the mutual deformation of adhesive particles that interact with van der Waals forces using
a viscoelastic theory that accounts for the time dependence of the phenomenon. The particle shape and
interaction is calculated self-consistently for finite-ranged forces. Typical loading-unloading trajectories
display hysteresis that increases with driving velocity, as does the particles' adhesion. An analytic
and found to be accurate.
All solids are elastic, some greatly so, and when they
interact they necessarily deform. All solids also experience
van der Waals forces, which give rise to attractive
interactions and adhesion. The deformation and forces
are intrinsically related, and both are large in the region
where the surface separation is small. The mutual
attraction of solids can be so great as to cause a noticeably
flattened contact region whose area is in essence deter-