PSI - Issue 60

Varsha Florist et al. / Procedia Structural Integrity 60 (2024) 614–630 Varsha Florist, Santhoshkumar R, A. Vamsi, Sajju V, Sarath Mohan, Sanjeev Kumar, Dhanoop A, Venukuttan C, M.K. Sundaresan, SVS Narayana Murty / Structural Integrity Procedia 00 (2024) 000 – 000 13

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Fig. 14. Tensile test results for preforms (ID 688mm x Thickness 30mm x Length 786mm) in solution treated condition: a) longitudinal (L); b) transverse (T) direction.

Fig. 15. Tensile test results of first articles in longitudinal direction for three specimen material condition: (a) solution treated + flow formed to 10 mm + solution treated + H1025; (b) solution treated + flow formed to 10 mm + solution treated flow formed to 4.2 mm +H1025; (c) First Article of 15-5PH flow formed shells- solution treated + flow formed to 10mm + solution treated + H1025. Tests results of pre-forms and flow formed shells are comparable with the specification, except few cases of low percentage elongation. The maximum obtained percentage elongation of shells in flow formed to 4.2 mm+ aged (H1025) condition was 11. However, in the solution treated (1038ºC) + aged (H1025) condition the percentage elongation obtained is 16, which confirms the lower percentage elongation is only due to direct aging. Since, the tank design is based on yield strength of the material, the slight lower percentage elongation is not a concern.