Biomedical Engineering Reference
In-Depth Information
and the boundary of the system simply leads to the pull-off (and snap-on)
events occurring further from the surface. For this reason the pull-off
force is a good engineering measure of “adhesion.”
Figure 4-15. The variations in the apparent force exerted by a surface on a probe as a
function of the actuator-imposed position of the probe relative to the surface. (Upper) The
probe spring is super-critical leading to a reversible work of separation defined by the
hatched area; (Lower) The probe spring is sub-critical leading to an irreversible work of
adhesion defined by the hatched area. Values are normalized using the characteristic
values ( Eqs. 4-22 a nd 4-25 ) .
The work that must be done to separate two bodies is per se easily
specified: simply integrate the force-position response over a specified
 
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