2.2. Method
2.2.1. Bending
The samples were bent using the three-point bending according to ISO
13061-3 [12]. Bending was carried out in universal testing machine FPZ
100/1 (HECKERT, Germany), which contained a special jig for flexural
tests and data logger ALMEMO 2690-8 (AHLBORN, Germany) for recording
the loading forces and deflection, with accuracy of 0.001 mm. Samples
were placed on supporting pins (l0 = 18 × h) so that the loading force
acted in the radial direction with respect to the length of the sample,
and a load was applied until it broke.