PSI - Issue 60

P.A. Jadhav et al. / Procedia Structural Integrity 60 (2024) 631–654 P. A. Jadhav et.al. / Structural Integrity Procedia 00 (2019) 000 – 000

646 16

1.E-08 1.E-07 1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00

Root radius = 10 micron Root radius = 50 micron Root radius = 100 micron Root radius = 300 micron

_

0

5

10

15

20

a/t (%)

Fig. 11. The plot of _ with respect to the mean value of flaw depth. ( = 100 MPa, mean 2 = 2.875 mm, = 35 ppm) The effect of the on the probability numbers is presented in Fig. 12. The effect is relevant in the area adjacent to rolled joint. As reported by Langille et. al. (2021) this area is also expected to have higher as the Zirconium material gets additional hydrogen from the end-fitting. Fig. 12 shows that the value of _ increases with in presence of residual stresses.

1.E-08 1.E-07 1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00

Residual stress = 0 MPa Residual stress = 50 MPa Residual stress = 100 MPa Residual stress = 120 MPa

_

0

5

10

15

20

a/t (%)

Fig. 12. The plot of _ with respect to the mean value of flaw depth ( = 50microns, mean 2 = 2.875 mm, = 35 ppm)