Biomedical Engineering Reference
In-Depth Information
Fig. 7.57 a Initial non-optimized seat geometry in the sagittal plane and b deformed state at
static equilibrium due to mechanical interaction with male model E-BCSS-3 exhibiting maximum
compressive stress underneath the ischial tuberosity
Fig. 7.58 a Optimized seat surface contour in the sagittal plane and b mechanical interaction
with male model E-BCSS-3 exhibiting reduced tissue stress, in particular beneath the ischial
tuberosity
In Fig. 7.55 a, the optimized seat surface contour generated with the procedure
described in Sect. 7.2.3 is depicted. In Fig. 7.55 b, the reduced tissue stress
distribution resulting from mechanical tissue-seat interaction and based on the
optimized seat contour is shown. As a result of surface topology optimization in
the transversal plane, direct compressive tissue stress S 22 (absolute values) was
reduced by 40 % (from -0.0129 to -0.0079 MPa).
In Table 7.9 and Fig. 7.60 a direct stress components S 11 and S 33, as well as
shear stress S 12 at the ischial tuberosity prior to and after seat surface optimi-
zation in conjunction with the male human model are depicted. In addition, in
Fig. 7.56 direct stress components S 11 ,S 33 and S 12 as well as VON M ISES
equivalent stress are shown in the transversal plane. The seat surface optimi-
zation led to a distinct reduction of compressive-, tensile- and shear stress, in
particular of the shear stress component S 12 (cf. Fig. 7.56 bottom), which could
be crucial in seat comfort.
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