PSI - Issue 60

S.K. Pandey et al. / Procedia Structural Integrity 60 (2024) 3–12 S. K. Pandey/ Structural Integrity Procedia 00 (2023) 000–000

8

6

α =2.948 ∗ n 2 − 25.74 ∗ T+58.15 α =4.358 ∗ n 2 − 32.74 ∗ T+64.98

(3)

(4)

Fig 9. Normalized-Mean- Offset vs. n for α =12 at T=298K

Fig 10. Optimized- α versus n at T=298K

Now, Normalized-Errors , for each set of (n, α ) of Fig.10, has been determined as provided in Fig.11. The minima of curve give optimized RO parameter- n (unique RO parameter- n) as 2.72. Optimized RO parameter- α (unique RO parameter- α) corresponding to n as 2.7 has been found as 10.0 from Eq. 3. Hen ce the unique RO parameters (n, α ) for SS316LN have been found as (2.72, 10.0) at the temperature of 298K. For the temperature of 923K, RO parameter- α versus RO parameter - n has been determined for minimum Normalized-Errors as given in Eq. 4. Normalized-Errors versus ‘n’ has been plotted in Fig.12. Unique RO parameters (n, α ) for SS316LN have been found as (2.67, 8.62) at the temperature of 923K. The optimized value of Ramberg-Osgood parameter for the SS316LN at the different temperatures is provided in Table 1.

Fig 12. Normalized error versus n curve for optimized-n at temperature of 923K

Fig 11. Variation of normalized-Mean-Offset with optimized-‘n’ at T=298K