Biomedical Engineering Reference
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Fig. 6.37 Simulation of the S 33 tissue stress distribution for a E-BCSS 1 and b E-BCSS 2 model
in the sagital plane of the ischial region (section cut view)
Fig. 6.38 Simulation of von Mises equivalent tissue stress distribution for a E-BCSS 1 and
b E-BCSS 2 model in the sagital plane of the ischial region (section cut view)
The diagrams in Fig. 6.39 show direct and shear stress S 33 and S 13 along the
previously described node paths of systems E-BCSS 1 and E-BCSS 2 involving the
human body models BoMo8 and BoMo12. The curves show moderate direct and
shear stress values from the skin level to approximately 40 mm tissue depth. Towards
the bone surface stress values increase. Apart from direct stress S 22 in the lateral
direction, which when comparing both models experiences a sign change, the direct
stress S 33 dominates. The highest shear stress, S 23 (male model) and S 12 (female
model), which is the same magnitude as the direct stress, occurs at the ischium.
E-BCSS 3 and E-BCSS 4: Figure 6.40 shows FE-interaction models, with a
male (E-BCSS 3) and a female (E-BCSS 4) human model. The corresponding node
paths for direct and shear stress from the skin to the ischial bone surface are
shown. Node paths are chosen such that both paths end at the point of maximum
direct stress S 33 at the ischium.
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