Biomedical Engineering Reference
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Figure 4-23. Schematic diagram of the approach, “snap-on,” contact, indentation, and
“pull-off” segments for a sphere contacting an adhesive surface. The incipient instability
configurations for the snap-on and pull-off events are shown as dotted lines in segments
(2) and (6). Such contacts are well described by the JKR contact adhesion model.
If the maximum displacement is large, the load-displacement
behavior approaches that for a non-adhesive Hertzian contact.
Infinitesimal reversal of
h
leads to quasi-equilibrium decrease of
a
through the same sequence of stable equilibria, passing through the
quiescent point (5) and the maximum adhesive force (
P
< 0) condition
(2), until an unstable equilibrium condition is met. Subsequent negative
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