Biomedical Engineering Reference
In-Depth Information
Figure 4-20. Variations in the contact load and displacement with contact radius for a
Hertzian contact perturbed by an adhesive interaction over the contact—the JKR model.
The adhesive interactions enable negative loads and displacements at small contact radii.
The values are normalized using the characteristic values
(Eqs. 4-56
t
o
4-58).
Figure 4-21. Variations in the contact load with displacement for a Hertzian contact
(dotted line) and a JKR contact. The adhesive interactions in the JKR model enable a
quiescent (zero-load) displacement separating positive-load indentation and negative-load
adhesive separation. Load- and displacement-controlled pull-off instabilities occur in the
negative load and displacement quadrant. The values are normalized using the
characteristic values
(Eqs. 4-56
to
4-58)
.
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