Supports - Preventive Biomechanics - page 172

Fig. 4.25 a Seat fabric material, b tensile test of a fabric sample in one fibre direction and
c hemispherical punch test of the leather cover material

Fig. 4.26 Tensile test force-displacement data of the fabric seat lining in a fibre direction 1 and
b fibre direction 2 and c indenter test of the fabric lining attached to the rim with pre-tension and
leather cover material

equilibrium elasticity according to ( 3.274 ) obtained through multi-criteria

optimization.
Force-displacement data obtained through hemispherical punch compression
testing of the foam core material, together with the cover material, are compared to
the data of the pure foam material, Fig. 4.23 . Here, an increase in stiffness of the
material compound system can be observed, compared to the pure foam material.
Figure 4.24 a depicts the corresponding FE-model of the indenter compression
test and the simulated force-displacement response of the equilibrium elasticity,
Fig. 4.24 b. The parameter optimization of the leather cover is based (at known
parameters of the foam material) on the M OONEY -R IVLIN model ( 3.201 ) with
f(J) according to ( 3.202 ) 4 for b = 0, observing optimization constrained in the
form of the force-displacement data of the compound material.

Seat System with Surface Fabric Lining and Leather Cover: This seat
system is composed of a fabric lining sheet with orthogonal fibre directions,
attached to an aluminum rim and a leather cover. In Fig. 4.25 a the lining with its
fibre materials is depicted and Fig. 4.25 b shows a tensile test with loading
direction along one fibre direction. The evaluated force-displacement data from
tensile testing in both fibre directions, Fig. 4.25 b, were used in a first