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 3

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2.1. Cylindrical Shell The minimum thickness of the shell is estimated by equating hoop stress to proof strength of the material assuming 90% weld efficiency. The thickness of cylindrical shell works out to be 4.2 mm and 4.6 mm based on the yield and ultimate strength of material. The minimum design thickness of shell was found to be 4.5 mm based on burst pressure criteria using the following equations, i.e, burst pressure should be higher than design ultimate pressure) A. P. Beena (1995), Christopher (2002), AseerBrabin (2011), Svensson (1958), LipingXue (2008). P b cyl(Svennsson)= η w (UTS)( 0.202.72+5 ε u )( 2.7 ε 1828 u ) ε u ( 2t c D i )(1 Ǧ t c D i ) (1) ( )= ( )( √ 2 3 )(2− ) ( ) (2) ( )= ( √3 )(1− 1 2 ), ℎ = (3) _ = √3 2 ( +1) ( ) (4) where, = , = , = = = = ℎ = = = ℎ ℎ 2.2. Tori-Spherical Dome ℎ ℎ , = ( 2( ) − 0.2 ) , <16.66 (5) = Radius of Spherical portion, = Radius of Toroidal portion The minimum thickness of the dome was worked out to be 3.41 mm based on yield strength using equation 5. Therefore, thickness of 3.5 mm was selected for design and buckling analysis was carried out on the tori-spherical end domes. 2.3. Finite Element (FE) Analysis 2D axi-symmetric geometric and material non-linear analysis for the single flow formed cylindrical shell with fore end dome and aft end dome has been carried out using the finite element software ANSYS Heckman (1998), AseerBrabin (2010). The FE model is shown in Fig. 1. ℎ , = 0.25 (3 + √ ) (6)