PSI - Issue 75

Alberto Campagnolo et al. / Procedia Structural Integrity 75 (2025) 564–571 Alberto Campagnolo, Giovanni Meneghetti/ Structural Integrity Procedia (2025)

569

6

2000

2000

Yonezawa et al. (2020) - t=12 mm

Yonezawa et al. (2020) - t=12 mm

1000

1000

744 540 392 296 214 156 (a)

492 357 259 296 214 156 (b)

Δσ eq,peak (MPa)

Δσ eq,peak (MPa)

550≤σ y <750 MPa 0.15

550≤σ y <750 MPa R≤0.15 T σ = 744/392 = 1.90 ( intrinsic ) Slope k = 5.0 ( imposed )

fitted on data

Campagnolo et al (2022)

100

100

N A

N A

1,E+04

1,E+05

1,E+06

1,E+07

1,E+04

1,E+05

1,E+06

1,E+07

Number of cycles to failure, N f

Number of cycles to failure, N f

2000

2000

Yonezawa et al. (2020) - t=12 mm

Yonezawa et al. (2020) - t=12 mm

1000

1000

427 310 225 296 214 156 (c)

433 314 228 296 214 156 (d)

Δσ eq,peak (MPa)

Δσ eq,peak (MPa)

550≤σ y <750 MPa 0.28

550≤σ y <750 MPa 0.40

fitted on data

Campagnolo et al (2022)

100

100

N A

1,E+04

1,E+05

1,E+06

1,E+07

N A

1,E+04

1,E+05

1,E+06

1,E+07

Number of cycles to failure, N f

Number of cycles to failure, N f

2000

Yonezawa et al. (2020) - t=12 mm

1000

331

Δσ eq,peak (MPa)

240 174 296 214 156 (e)

550≤σ y <750 MPa R>0.52 T σ = 331/174 = 1.90 ( intrinsic ) Slope k = 5.0 ( imposed )

fitted on data

100

N A

1,E+04

1,E+05

1,E+06

1,E+07

Number of cycles to failure, N f

Fig. 3: Fatigue assessment of weld toe failures in HFMI treated welded joints according to the PSM approach. Joints made of a high-strength steel having 550 ≤ σ y < 750 MPa and tested under (a) R ≤ 0.15, (b) 0.150.52. The dotted blue lines are the PSM-based scatter band valid for as-welded joints.