PSI - Issue 33

Irina A. Bannikova et al. / Procedia Structural Integrity 33 (2021) 357–364 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

360 4

300

500

a

b

No.1 No.2 No.4

250

400

200

300

150

200

F, kN

p, MPa

100

No.1 No.2 No.4

100

50

0

0

0

1

2

3

0

0.5

1

1.5

2

t, s

Stroke, mm

Fig. 3. (a) – Dependence of loading force F on displacement; (b) – Loading pressure depending on the time of movement of the plate.

a

b

Fig. 4. Specimens after quasi-static uniaxial loading. (a) – Sample No. 4 and its fragments; (b) – Sample No. 2.

The Fig. 6 shows video footage from a high-speed camera Photron FASTCAM SA-Z 2100K (Fig. 2, a) under quasi-static loading of the 4th sample (see Fig. 1 and Fig. 4, a ). As can be seen, in the first frames, there are short fleshes corresponding to the formation of cracks inside the sample, but the sample is still standing. Then (through 4.23 µs) , after a while, a brighter and more prolonged glow, which corresponds to the formation of multiple fragments at the boundary of the cracks. Subsequent flares correspond to the formation of cracks in the formed fragments along the height.