Biomedical Engineering Reference
In-Depth Information
Fig. 7.4 Force-displacement data of the reference foam ''RD59'' (factor 1.0) and the factorized
force-displacement curves (force-displacement scales have been removed due to confidentiality)
Table 7.1 Body mass distribution in percent
Relative weight (%)
Fischer
Hochmuth
Bernstein
Standard
Men
Women
Head
7.06
8.1
6.72
8.12
7
Trunk
42.70
49.1
46.30
43.90
43
Upper arm
3.36
2.8
2.65
2.60
3
Forearm
2.28
1.6
1.82
1.82
2
Hand
0.84
0.6
0.70
0.55
1
Thigh
11.58
9.9
12.21
12.89
12
Shank
5.27
4.0
4.65
4.34
5
Foot
1.79
1.4
1.46
1.29
2
data curve by 0.5. The corresponding material parameters were derived by curve-
fitting based on the generated force-displacement curves, cf. Fig. 7.4 .
All virtually generated (factorized) soft foam material data were used in the inter-
action simulations as follows. By comparing the different foam materials and bedding
systems, the optimal combination to minimize tissue stress and strain was sought.
7.1.2 FE-Modelling of Human Body Models
The female human body model BoMo2 and the male model BoMo4 (see Sect.
5.3.4 ) were used in the numerical analysis. Both models were modified with
respect to particular percentile adjustments as described in the following.
7.1.2.1 Weight and Mass Distribution
Static loading of the support system results from gravity and the mass of the par-
ticular body model. Additional masses were assigned to the bone structure to meet a
specified total mass. The employed mass distribution can be found in, Table 7.1 .
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