Biomedical Engineering Reference
In-Depth Information
0.020
0
1 day
2 days
5 days
10 days
20 days
30 days
50 days
75 days
100 days
0.015
0.010
e
0.005
0.000
0.026
0.028
0.030
0.032
0.034
0.036
r
(
m
)
FIGURE 3.12
Variation of
e
with time
t
along the radii for coupled loads.
• Case 4:
p
(
t
) = 1 MPa,
P
= 1500 N,
T
0
(
t
) = 0.1°C, φ
b
− φ
a
= 30V, ψ
b
− ψ
a
= 1A.
• Figure 3.12 shows the variation of
e
with time
t
in the transverse
direction when subjected to coupled loads. The preceding load-
ing case is considered to study the coupling effect of electric-
magnetic and mechanical loads on bone structure. It can be seen
from Figure 3.12 that the function of coupled loads is the super-
position of the constituent single loads. They are, however, not
simply linearly superposed. The combination of magnetic, elec-
tric, thermal, and mechanical loads results in significant changes
in bone structure and properties of bone tissues. This indicates
that loading coupled fields is more effective in modifying bone
structure than loading only one kind of field.
References
1. Frost H. M. Dynamics of bone remodeling. In
Bone biodynamics,
ed. Frost H. M.,
p. 316. Boston: Little and Brown (1964).
2. Charnay A., Tschantz J. Mechanical influences in bone remodeling, experimental
research on Wolff's law.
Journal of Biomechanics
5: 173-180 (1972).
3. Cowin S. C., Hegedus D. H. Bone remodeling.1. Theory of adaptive elasticity.
Journal of Elasticity
6 (3): 313-326 (1976).
