PSI - Issue 33

363 7

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

0.16

2.5

8

0.4

7

1

0.315

0.2

5

1

0.05

4

2

1

1.6

3

0.63

Fig. 8. Sorting of fragments using electronic balance HR-202i 1 and a sieves system 2 with its characteristic size of the opening – d* , mm. Fragments of the No. 2 sample after quasi-static uniaxial loading.

We analyzed the time intervals between fractoluminescence pulses obtained by a PMT. An amplitude of 0.05 on the signal corresponded to noise. Fig. 9, b shows the cumulative distributions of the number N t of time intervals greater than a certain specified from time intervals t imp between damping off pulses of the entire signal (Fig. 7).

10000000

1000

N = 8.75m -0.914 R² = 0.99

N = 0.57m -1.426 R² = 0.99 N = 12.46m -0.866 R² = 0.99 N = 2.12m -1.334 R² = 0.96

No. 3

a

b

1000000

II

No.1

100000

N t = 27.08t imp R² = 0.93

-0.434

100

No.2

10000

N = 19.72m -0.738 R² = 0.99

N t

N

No.3

1000

N t = 30.17t imp R² = 0.95

-0.358

N = 27.16m -0.691 R² = 0.99

I

10

100

No.4

N = 0.85m -1.324 R² = 0.98 N = 0.94m -1.429 R² = 0.99

N t = 39.10t imp R² = 0.90

-0.655

10

1

1

0.01 0.1

1

10

100

0.0000001 0.00001 0.001

0.1

m, g

t imp , µ s

Fig. 9. (a) cumulative fragments mass distributions of samples. Logarithmic axes; (b) cumulative distributions of the number of time intervals, N t (t imp ), between pulses in a signal by PMT. Logarithmic axes.

The distributions of N t ( t imp ) are described by a power function too. The results agree with the data obtained under dynamic loading of used silica (quartz) rods, Davydova and Uvarov (2013). The presence of a power function