Biomedical Engineering Reference
In-Depth Information
δ = 1 µm
δ = 2 µm
δ = 3 µm
0.01
0.00
-0.01
-0.02
-0.03
ε
-0.04
-0.05
-0.06
-0.07
-0.08
0
500
1000
1500
2000
t
(day)
(a)
0.01
δ = 1 µm
δ = 3 µm
δ = 5 µm
0.00
-0.01
-0.02
-0.03
η
-0.04
-0.05
-0.06
-0.07
-0.08
0
500
1000
1500
2000
t
(day)
(b)
FIGURE 4.5
Variation of ε and η with time
t
induced by a solid pin. (a) ε versus
t;
( b) η versus
t.
pressure on the interface will cause damage to the bone struc-
ture. Thus, the radius of the pin should be kept within an appro-
priate range.
• Case 5: A hollow, inhomogeneous circular cylindrical bone sub-
jected to external loads
• The external loads are
p
= 1 MPa, P = 1500 N,
T
= 30°C, and
φ
b
- φ
a
= 30 V. The geometrical and material parameters of this
problem are the same as those used in the previous cases, except
that all material constants at the beginning of this section are now
modified by a multiplier [1 - (1 - ξ)(
b
-
r
)/(
b
-
a
)], where 0 ≤ ξ ≤ 1
