NANOINDENTATION OF TOOTH TISSUES - Nanoindentation with Biological Applications - page 248

(a)

(b)
Figure 8-6. (a) Energy expenditure of enamel from different indenters as a function of
indentation contact strain; (b) Comparison of energy absorption ability between enamel
and HAP disk based on the nominally 10 μ m spherical and Berkovich indenters.

U %- part for strain values less than 0.5 and the curve started from 0%.
Although the major component of the two materials in Fig. 8-6b was
similar, enamel had slightly higher energy dissipation ability (~10%)
than HAP at the same strain level. The origin of slightly higher energy
expenditure from Berkovich indenter may be because the Berkovich
indenter has a sharp tip and ridges with higher local stresses in their
vicinity and in addition it may cause cracks, which is another source of