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Interaction and Deformation of Elastic Bodies: Origin of Adhesion Hysteresis Phil Attard

Summary: Interaction and Deformation of Elastic Bodies: Origin of Adhesion Hysteresis
Phil Attard
Ian Wark Research Institute, UniVersity of South Australia, Mawon Lakes, SA 5095, Australia
ReceiVed: May 23, 2000; In Final Form: August 29, 2000
The deformation and adhesion of soft elastic particles interacting with a Lennard-Jones potential is obtained
by solving self-consistently the elasticity equations. Hysteresis is demonstrated between loading and unloading.
Also, the pull-off force or maximum adhesion is shown to increase and eventually to saturate as the maximum
applied load is increased. The origin of both of these phenomena, which have been observed experimentally,
is traced to limited equilibration and dynamic hysteresis of the shape and contract angle between the advancing
and receding deformed solids.
The adhesion of particles to each other or to a substrate occurs
in many areas of applied science and technology, and hence its
measurement, understanding, and control is important. Adhesion
is related to the surface energy of the solids, which is a
fundamental quantity dependent upon the surface chemistry and
the molecular structure of the solid, and the nature of the
adjacent fluid interface. Also important is the elasticity of the
particles, since all solids are deformable to varying degrees,
and their change in shape when they interact is affected by their


Source: Attard, Phil - School of Chemistry, University of Sydney


Collections: Chemistry