3.1. Two-layer composition of hard and soft material (Sct + Hb)
The group composition consisted of soft material with constant
thickness (c) of 2 mm and hard material was placed in the bottom
layer, with thickness increase in the individual compositions by 2 mm
up to 20 mm. The increasing thickness of hard material affects signifi-
cantly the complete model. The bendability is decreasing, see Fig. 8.
The breaking is occurred in the compositions Sct2 + Hb2 up to
Sct2 + Hb6 and Sct2 + Hb12.