Biomedical Engineering Reference
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40
intact/5 Hz
intact/10 Hz
denucleated/5 Hz
30
20
10
0
0
0.1
0.2
0.3
0.4
0.5
Time (s)
(a)
13
intact/40 N
intact/20 N
11
9
7
5
3
0
0.1
0.2
0.3
0.4
0.5
Time (s)
(b)
FIgure 15.9
The dynamic responses of facet contact force in the finite element models without damping
under axial cyclic loads for different frequencies and loads and degenerated discs: (a) for case 1, case 2, and
case 6; (b) for case 1 and case 3.
table 15.4
Case-to-Case amplitude ratio r
CC
of Facet Contact Forces for different Cases
Intact model
denucleated model
about
r
CC
Cases
Case 1
Case 2
Case 3
Case 4
Case 5
Case 6
Case 7
Case 8
R
CC
—
1.55
0.402
0.746
0.506
Versus
case 1
1/R
CC
0.645
2.49
1.34
1.98
R
CC
—
0.901
0.895
Versus
case 6
1/R
CC
1.11
1.12
Note:
The ratios were obtained based on Equations 15.1 and
15.2.
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