Biomedical Engineering Reference
In-Depth Information
Fig. 10.6
Variations of (
a
) fiber radius
R
n
,(
b
) fiber length
L
n
,(
c
) area fraction
'
n
,(
d
) work of
adhesion
W
a
n
,(
e
) adhesion strength
S
n
,(
f
) pull-off force
F
n
, and (
g
) the number of fibers
N
n
as a
function of the hierarchical level
n
evaluate the density
N
2
=pR
3
of the second level fiber to be 11,494 mm
2
,
7,363 mm
2
, 3,439 mm
2
for triangular, square, and hexagonal patterns, respec-
tively. This is also comparable to the observed density of gecko's seta around
14,400 mm
2
[
3
]. Interestingly, in nature, the spatula density within single species
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