Issue 36

I. Camagic et alii, Frattura ed Integrità Strutturale, 36 (2016) 1-7; DOI: 10.3221/IGF-ESIS.36.01 4 Specimen Temperature °C Fatigue threshold ΔK th Coefficient C Exponent m da/dN. m/cycle ΔK = 10 MPa  m PM-1-1n 20 5.9 5.70 · 10 -12 2.98 5.44 · 10 -9 PM-1-2n 5.6 5.38 · 10 -12 3.02 5.63 · 10 -9 PM-1-3n 5.8 6.23 · 10 -12 2.83 4.21 · 10 -9 PM-2-1n 540 5.2 1.52 · 10 -10 2.94 1.32 · 10 -7 PM-2-2n 5.1 2.08 · 10 -10 2.88 1.58 · 10 -7 PM-2-3n 5.0 1.11 · 10 -10 2.99 1.08 · 10 -7 Table 5 : Fatigue crack growth parameters for specimens with notches in new PM. Specimen Temperature °C Fatigue threshold ΔK th Coefficient C Exponent m da/dN. m/cycle ΔK = 10 MPa  m PM-1-1e 20 5.2 4.45 · 10 -12 3.76 2.56 · 10 -8 PM-1-2e 5.1 3.89 · 10 -12 3.87 2.88 · 10 -8 PM-1-3e 5.2 5.17 · 10 -12 3.71 2.65 · 10 -8 PM-2-1e 540 4.7 1.48 · 10 -8 1.80 9.34 · 10 -7 PM-2-2e 4.6 2.67 · 10 -8 1.68 1.28 · 10 -6 PM-2-3e 4.7 1.25 · 10 -8 1.84 8.65 · 10 -7 Table 6 : Fatigue crack growth parameters for specimens with notches in exploited PM. Specimen Temperature °C Fatigue threshold ΔK th Coefficient C Exponent m da/dN. m/cycle ΔK = 10 MPa  m WM-1-1e 20 6.8 2.14 · 10 -11 2.53 7.25 · 10 -9 WM-1-2e 6.9 3.55 · 10 -11 2.38 8.71 · 10 -9 WM-1-3e 6.7 1.98 · 10 -11 2.56 7.19 · 10 -9 WM-2-1e 540 5.8 1.26 · 10 -9 2.51 4.08 · 10 -7 WM-2-2e 5.6 1.78 · 10 -9 2.47 5.25 · 10 -7 WM-2-3e 5.5 2.24 · 10 -9 2.21 3.63 · 10 -7 Table 7 : Fatigue crack growth parameters for specimens with notches in WM. Specimen Temperature °C Fatigue threshold ΔK th Coefficient C Exponent m da/dN. m/cycle ΔK = 10 MPa  m HAZ-1-1n 20 5.7 2.55 · 10 -11 2.48 7.70 · 10 -9 HAZ-1-2n 5.4 2.97 · 10 -11 2.41 7.63 · 10 -9 HAZ-1-3n 5.5 2.08 · 10 -11 2.57 7.72 · 10 -9 HAZ-2-1n 540 4.9 9.61 · 10 -10 2.47 2.84 · 10 -7 HAZ-2-2n 4.7 7.45 · 10 -10 2.83 5.03 · 10 -7 HAZ-2-3n 4.8 8.85 · 10 -10 2.68 4.24 · 10 -7 Table 8 : Fatigue crack growth parameters for specimens with notches in new HAZ. Specimen Temperature °C Fatigue threshold ΔK th Coefficient C Exponent m da/dN. m/cycle ΔK = 10 MPa  m HAZ-1-1e 20 4.8 1.54 · 10 -10 2.62 6.42 · 10 -8 HAZ-1-2e 4.6 1.95 · 10 -10 2.57 7.24 · 10 -8 HAZ-1-3e 4.5 2.35 · 10 -10 2.51 7.60 · 10 -8 HAZ-2-1e 540 4.2 5.50 · 10 -9 2.33 1.18 · 10 -6 HAZ-2-2e 4.1 4.67 · 10 -9 2.49 1.44 · 10 -6 HAZ-2-3e 4.3 6.24 · 10 -9 2.11 8.04 · 10 -7 Table 9 : Fatigue crack growth parameters for specimens with notches in exploited HAZ.