Biomedical Engineering Reference
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Fig. 4.7 Isotropy and homogeneity of soft foam samples: a segmentation of a foam block in
20 9 10 prismatic samples of edge size 100 mm, b force-displacement data of different samples
obtained from plate compression and c indentation force dependency on relative humidity,
(Schrodt 2006)
Fig. 4.8 Specimen preconditioning to eliminate stress softening: a force over time characteristic
and b force over displacement characteristic of high resilient PU foam at plate compression
standardized testing with an edge length of 100 mm and a prismatic shape. The
change in sample size was due to sample buckling during plate compression,
Fig. 4.8 d, (Schrodt 2006).
For
the
quad
lap
shear
test
(3)
foam
specimens
with
the
dimensions
H 9 W 9 D = 80 9 35 9 10 mm were used.
Employed Elastomeric Materials: Many varieties of polymeric soft foam
material exist, together with a wide application range in medical care and comfort
related fields. In general, the mechanical behaviour of foam materials significantly
differs. Since the primary intention of this topic is to present methodological
approaches,
two
mechanically
and
chemically
different
foam
materials
are
exemplarily presented.
Material testing was performed using two foam materials, high resilient (HR)
foam, without remarkable time-dependence, and viscoelastic (VE) foam, exhib-
iting distinct retarded recovery behaviour (note that all polymeric foam materials
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