PSI - Issue 68

3

N. Bykiv et al. / Structural Integrity Procedia 00 (2025) 000–000

N. Bykiv et al. / Procedia Structural Integrity 68 (2025) 405–408

407

a

b

500

450

400

400

350

300

300

200

σ, MPa

σ, MPa

250

100

200

0

0,0

0,5

1,0

1,5

2,0

0,0

0,5

1,0

1,5

2,0

ε, %

ε, %

c

d

0 100 200 300 400 500 600 0 100 200 300 400 500 600

250 300 350 400 450 500 550

σ, MPa

σ, MPa

0

1

2

3

4

5

6

7

0

1

2

3

4

5

6

ε, %

ε, %

e

f

250 300 350 400 450 500 550

σ, MPa

σ, MPa

0,0

0,5

1,0

1,5

2,0

2,5

3,0

0,0

0,5

1,0

1,5

ε, %

ε, %

Fig. 2. Hysteresis loops of cycles 1 (blue), 10 (red), 100 (green) and 1000 (violet) for specimens 1 (a), 4 (b), 2(c), 5(d), 3(e), 6 (f)

Since the dissipated energy W dis , is directly related to the area of the hysteresis loop, an increase in the stress ratio from 0.1 to 0.5 results in a decrease in the energy dissipated per cycle (Fig. 3). During the first 10-20 cycles, the dissipated energy decreases sharply for both values of the stress ratio and reaches the stabilisation plateau.