PSI - Issue 60

K. Mariappan et al. / Procedia Structural Integrity 60 (2024) 444–455 Author name / StructuralIntegrity Procedia 00 (2019) 000 – 000

447

4

Fig. 3 Strain-time waveform used in strain controlled LCF followed by tensile tests.

600

Type 316 L(N) SS 300 K

400

200

0

-200

Stress (MPa)

-400

1 Cycle

0.05 N f 0.3 N f

0.1 N f 0.5 N f

-600

N f (1837)

-0.6 -0.4 -0.2 0.0 0.2 0.4 0.6

Strain (%)

Fig. 4 Hysteresis loops obtained at room temperature after 1, 90, 180, 550, 900 and 1837 cycles, corresponding to the 0 N f , 0.05 N f , 0.1 N f , 0.3 N f , 0.5 N f and N f of the total fatigue life, respectively.

300 K 823 K 873 K

(a)

Type 316 L(N) SS

(b)

500

450

400

400

350

300

300

50 % of N f

30 % of N f

10 % of N f

250

300 K 823 K 873 K

5 % of N f

Peak Stress (MPa)

Peak Stress (MPa)

200

200

100

150

0

10

20

30

40

50

0.1

1

10

100

Fatigue Life Fraction (% N f )

Fatigue Life Fraction, %

Fig. 5 (a) Normalized cyclic stress response curve and (b) tensile peak stress values for 0 N f , 0.05 N f , 0.1 N f , 0.3 N f , 0.5 N f at 300, 823 and 873 K.