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 9

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microscope with DHS microcam CMOS camera and optical photographs were recorded. Oxford – Energy Dispersive X-ray Spectroscopy (EDS) was used for identifying the chemistry of second phase particles or inclusions

present in the specimens. 5. Results and Discussion

Before realizing the 700 mm diameter flow formed cylindrical shell for the flight tank, a 200mm nominal diameter sub-scale cylindrical shell was realized and subjected to H1025 heat treatment condition. Ductile failure in 4.2mm thick cylindrical shell membrane region was observed at 56.5 MPa against a predicted burst pressure of 58.5 MPa [from Svensson criteria for realized property] and the burst tested hardware is shown in Fig. 8.

Fig. 8. Photographs of the burst tested 15-5 PH sub-scale pressure vessel. Failure was observed in 4.2mm cylindrical Shell.

L at Control Location H at Control Location

4000

L at Dome I H at Dome I

L at A side of Dome I to cyl. shell weld H at A side of Dome I to cyl. shell weld L L at A side of Dome I to cyl. shell weld H at B side of Dome I to cyl. shell weld L at A side of Dome II to cyl. shell weld H at A side of Dome II to cyl. shell weld L at B side of Dome II to cyl. shell weld H at Bside of Dome II to cyl. shell weld

3000

2000

1000

STRAIN (microstrain)

0

0

10

20

30

40

PRESSURE (MPa)

Fig. 9. Hoop (H) and meridional (L) strain at different locations on subscale tank