PSI - Issue 60

Ganesh Nigudage et al. / Procedia Structural Integrity 60 (2024) 678–689 Ganesh Nigudage /Structural Integrity Procedia 00 (2023) 000 – 000

686

=0.2584× ℎ 0 × =0.244× 0.48 ℎ 02 =0.20× 0.65 ℎ 02 =0.2279× 0.48 ℎ 02 +45.204 (r = 0.985) =0.194× 0.65 ℎ 02 +21.53 ( =0.983) ( =0.999) ( =0.999) ( =0.999)

(16)

(17)

(18)

(19)

(20)

4.3. Total elongation correlations There are three ways to generate empirical correlations for total elongation- i. using displacement at maximum force v m ii. using displacement at maximum force normalized by initial specimen thickness h o. iii. establishing linear regression of the form = 1 × ( −ℎ 0 ℎ ) 0 + 2 The following correlations were obtained for total elongation- = 16.98 × −13.22 ( =0.55)

(21)

(22)

( =0.998) ( =0.396) ( =0.998) ( =0.997)

= 9.98 × =5.946× ℎ 0 −3.54 =5.006× ℎ 0 =5.63× ( −ℎ 0 ℎ ) 0

(23)

(24)

(25)

=2.414× ( −ℎ 0 ℎ ) 0 +10.78 ( =0.313)

(26)

(27)

5. Validation of empirical correlation constants The correlations generated for yield strength, tensile strength and total elongation are validated by comparing the SPT estimated properties from the generated correlations with known uniaxial tensile properties for thermal base and thermal weld tested at room temperature and -60 o C . The characteristic values of force, punch displacement for tests of thermal base and thermal weld are provided in Table 3. The percentage error in estimation of the tensile properties from SPT by each correlation is shown in Table 4. In this case, SPT testing and analysis was done for two specimens in each of the material condition and test temperature and these specimens are mentioned as spn1 and spn 2 in Table 4 .