PSI - Issue 75

Mehdi Ghanadi et al. / Procedia Structural Integrity 75 (2025) 457–466 Mehdi Ghanadi et al./ Structural Integrity Procedia (2025)

462

6

undercut criteria for 2 mm plates is 0.1 T and apply only to quality level C, while for 16 mm plates it is 0.03125 T and it is the same for levels B and C .

Figure 5.Variation of weld geometry parameters.

5. Angular misalignment Misalignment induces secondary bending stress, reducing fatigue strength. It can be seen that angular misalignment, measured with the Winteria® laser scanner, is more significant in 2 mm plates than in 16 mm plates, especially for weld quality C, Fig. 6. This also in accordance with previous studies (Ghanadi et al., 2025), which showed that correcting angular misalignment in the fatigue assessment is necessary in order to improve fatigue estimations.

m k , according to Eq. (1) (Hobbacher

Angular misalignment is considered by applying a stress magnification factor,

& Baumgartner, 2024):

l l 

1 = +    

k

(1)

1 2

( T l l  +

)

m

1

2

, m eff k , is calculated according to Eq. (2), with ,

cov m already ered k is set to 1.2

The effective stress magnification factor, according to (Hobbacher & Baumgartner, 2024):

k

k

=

, m calculated

(2)

k

, m eff

, m already ered cov