Issue 36

I. Camagic et alii, Frattura ed Integrità Strutturale, 36 (2016) 1-7; DOI: 10.3221/IGF-ESIS.36.01

Specimen

Coefficient C 5.70 · 10 -12 5.38 · 10 -12 6.23 · 10 -12 1.52 · 10 -10 2.08 · 10 -10 1.11 · 10 -10 Coefficient C 4.45 · 10 -12 3.89 · 10 -12 5.17 · 10 -12 1.48 · 10 -8 2.67 · 10 -8 1.25 · 10 -8 Coefficient C 2.14 · 10 -11 3.55 · 10 -11 1.98 · 10 -11 1.26 · 10 -9 1.78 · 10 -9 2.24 · 10 -9 Coefficient C 2.55 · 10 -11 2.97 · 10 -11 2.08 · 10 -11 9.61 · 10 -10 7.45 · 10 -10 8.85 · 10 -10 Coefficient C 1.54 · 10 -10 1.95 · 10 -10 2.35 · 10 -10 5.50 · 10 -9 4.67 · 10 -9 6.24 · 10 -9

Exponent m

da/dN. m/cycle ΔK = 10 MPa  m

Temperature °C

Fatigue threshold ΔK th

PM-1-1n PM-1-2n PM-1-3n PM-2-1n PM-2-2n PM-2-3n

5.9 5.6 5.8 5.2 5.1 5.0

2.98 3.02 2.83 2.94 2.88 2.99

5.44 · 10 -9 5.63 · 10 -9 4.21 · 10 -9 1.32 · 10 -7 1.58 · 10 -7 1.08 · 10 -7

20

540

Table 5 : Fatigue crack growth parameters for specimens with notches in new PM.

Specimen

Exponent m

da/dN. m/cycle ΔK = 10 MPa  m

Temperature °C

Fatigue threshold ΔK th

PM-1-1e PM-1-2e PM-1-3e PM-2-1e PM-2-2e PM-2-3e

5.2 5.1 5.2 4.7 4.6 4.7

3.76 3.87 3.71 1.80 1.68 1.84

2.56 · 10 -8 2.88 · 10 -8 2.65 · 10 -8 9.34 · 10 -7 1.28 · 10 -6 8.65 · 10 -7

20

540

Table 6 : Fatigue crack growth parameters for specimens with notches in exploited PM.

Specimen

Exponent m

da/dN. m/cycle ΔK = 10 MPa  m

Temperature °C

Fatigue threshold ΔK th

WM-1-1e WM-1-2e WM-1-3e WM-2-1e WM-2-2e WM-2-3e

6.8 6.9 6.7 5.8 5.6 5.5

2.53 2.38 2.56 2.51 2.47 2.21

7.25 · 10 -9 8.71 · 10 -9 7.19 · 10 -9 4.08 · 10 -7 5.25 · 10 -7 3.63 · 10 -7

20

540

Table 7 : Fatigue crack growth parameters for specimens with notches in WM.

Specimen

Exponent m

da/dN. m/cycle ΔK = 10 MPa  m

Temperature °C

Fatigue threshold ΔK th

HAZ-1-1n HAZ-1-2n HAZ-1-3n HAZ-2-1n HAZ-2-2n HAZ-2-3n

5.7 5.4 5.5 4.9 4.7 4.8

2.48 2.41 2.57 2.47 2.83 2.68

7.70 · 10 -9 7.63 · 10 -9 7.72 · 10 -9 2.84 · 10 -7 5.03 · 10 -7 4.24 · 10 -7

20

540

Table 8 : Fatigue crack growth parameters for specimens with notches in new HAZ.

Specimen

Exponent m

da/dN. m/cycle ΔK = 10 MPa  m

Temperature °C

Fatigue threshold ΔK th

HAZ-1-1e HAZ-1-2e HAZ-1-3e HAZ-2-1e HAZ-2-2e HAZ-2-3e

4.8 4.6 4.5 4.2 4.1 4.3

2.62 2.57 2.51 2.33 2.49 2.11

6.42 · 10 -8 7.24 · 10 -8 7.60 · 10 -8 1.18 · 10 -6 1.44 · 10 -6 8.04 · 10 -7

20

540

Table 9 : Fatigue crack growth parameters for specimens with notches in exploited HAZ.

4