PSI - Issue 57

Alberto Visentin et al. / Procedia Structural Integrity 57 (2024) 524–531 Alberto Visentin et al./ Structural Integrity Procedia 00 (2023) 000 – 000

526

3

a)

1500

Δσ A,50% = 214 MPa N A = 2 ∙10 6 cycles Scatter Index (2.3%-97.7%): T σ = 296/156 = 1.90 Slope k = 3.0 PSM design scatter band for steel joints, λ = 0 (NOT FITTED)

1000

Δσ eq,peak [MPa]

λ=0, toe failure, AW, CA λ=0, toe failure, SR, CA λ=0, root failure, AW, CA λ=0, toe failure, AW, VA ≈ 1500 experimental data

296 214

D 2.3% = 2.65 D 50% = 1.00 D 97.7% = 0.39

156

100

N A

1,E+04

1,E+05

1,E+06

1,E+07

N 0 [cycles]

b)

1500

PSM design scatter band for steel joints, λ > 0 (NOT FITTED)

1000

Δσ A,50% = 354 MPa N A = 2 ∙10 6 cycles Scatter Index (2.3%-97.7%): T σ = 488/257 = 1.90 Slope k = 5.0

488 354

Δσ eq,peak [MPa]

D 2.3% = 4.98 D 50% = 1.00 D 97.7% = 0.20

257

≈ 540 experimental data

λ > 0, Root Failure, AW, CA λ > 0, Root Failure, SR, CA λ > 0, Toe Failure, AW, CA λ > 0, Toe Failure, SR, CA λ > 0, Root Failure, AW, VA λ > 0, Toe Failure, SR, VA

100

N A

1,E+04

1,E+05

1,E+06

1,E+07

N 0 [cycles]

Figure 1 . PSM-based fatigue assessment of weld toe and weld root failures in welded joints made of structural steels tested in the as-welded or stress-relieved conditions and subjected to Constant Amplitude (CA) (Meneghetti and Campagnolo 2020) or Variable Amplitude (VA) (Campagnolo et al. 2022; Vecchiato et al. 2023) (a) pure mode I and (b) multiaxial local stresses. The design scatter bands for pure mode I (λ = 0 in Table 1) and for multiaxial local stresses (λ > 0 in Table 1) have been calibrated in (Meneghetti and Lazzarin 2011) and (Meneghetti 2013), respectively, and are not fitted on the experimental data shown in the figure. 2. Automated implementation of the PSM and variable amplitude fatigue life estimations An interactive analysis tool has been developed in Ansys ® Mechanical to support the FE analyst in automating the fatigue design of complex welded structures (Visentin et al. 2022a). The developed application is based on the Ansys ® Customization Toolkit (ACT) and allows to consider both uniaxialand multiaxial local stress states according to the