Fig. 8

Compression of the cylindrical samples at different time intervals. Top: 3 × 3 × 3 mm, middle: 4 × 4 × 4 mm and bottom: 5 × 5 × 5 mm. At t5 the maximum compression force of 5 kN is reached for the 4 × 4 × 4 mm and 5 × 5 × 5 mm samples. Note that at t3 a load of 5 kN is reached for the 3 × 3 × 3 mm sample. Video recordings of these tests can be found in the (supplementary data) Additional files 1, 2 and 3.