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
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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