Structural Analysis of Metallic Pressure Vessels With Weld Sinkage in the Circumferential Joint

Year 2021, Volume: 2 Issue: 1, 4 - 10, 21.06.2021

Chıtaranjan Pany

https://doi.org/10.5281/zenodo.4586360

Abstract

The presence of weld sinkage in cir-seam joint of pressure vessels (cylindrical and spherical) has been investigated in this work. The discontinuity considered here is named as weld sinkage. The corresponding discontinuity stress introduced during fabrication process is analysed. Here only geometric aspects are being considered and the discontinuities are assumed to be free of residual stress. Non-linear finite element analysis (NL-FEA) performed. The vessel material of HSLA 15CDV6 is considered. Graphically the deformations and stress distributions( meridional, hoop and effective) along axial distance are shown. The effective (von-Mises) stress is found at sinkage location around 2 and 4 times higher than nominal stress( stress away from sinkage location) for cylindrical and spherical vessel respectively.

Circumferential joint 

Keywords

Finite element analysis, weld sinkage, Nonlinear analysis, Pressure vessels, Circumferential joint

Structural Analysis of Metallic Pressure Vessels With Weld Sinkage in the Circumferential Joint

Abstract

The presence of weld sinkage in cir-seam joint of pressure vessels (cylindrical and spherical) has been investigated in this work. The discontinuity considered here is named as weld sinkage. The corresponding discontinuity stress introduced during fabrication process is analysed. Here only geometric aspects are being considered and the discontinuities are assumed to be free of residual stress. Non-linear finite element analysis (NL-FEA) performed. The vessel material of HSLA 15CDV6 is considered. Graphically the deformations and stress distributions( meridional, hoop and effective) along axial distance are shown. The effective (von-Mises) stress is found at sinkage location around 2 and 4 times higher than nominal stress( stress away from sinkage location) for cylindrical and spherical vessel respectively.

Keywords

Circumferential joint, finite element analysis, weld sinkage, Nonlinear analysis, Pressure vessels

References

• [1] P.T. Bizon, “Elastic stresses at a mismatched circumferential joint in a pressurized cylinder including thickness changes and meridional load coupling,” Lewis Research Center, Cleveland, Ohio, USA, Technical Note TN-D-3609 (1-45), 1966.
• [2] A. Subhananda Rao, G. Venkata Rao and B. Nageswara Rao, “Effect of long seam mismatch on the burst pressure of maraging steel rocket motor case,” Eng. Fail. Anal., vol. 12, pp. 325-336, 2005.
• [3] Sreelakshmi MG, C.Pany, “Stress analysis of metallic pressure vessels with circumferential mismatch using finite element method,” Int. J. of Sci. and Eng.Res.,vol.7(4),pp.479-484,2016.
• [4] C.Pany, M.K. Sundaresan, B. Nageswara Rao,B. Sivasubramonian, and N. Jayachandran Nair, “On the bursting of an HSLA steel rocket motor case duringproof pressure testing,” Steel Grips (J. of Steel and related Mater.) App., vol. 10, pp. 434-438, 2012.
• [5] T. AseerBrabin, T. Christopher and B. Nageswara Rao, “Finite element analysis of cylindrical pressure vessels having a misalignment in a circumferential joint,” Int. J. of Press. Vessels and pip., vol. 87, pp. 197-201, 2010.
• [6] R.H. Johns and T.W.Orange, “Theoretical elastic stress distributions arising from discontinuities and edge loads in several shell-type structures,” Lewis Research Center, Cleveland, Ohio, USA, Technical Report TR-R-103 (1-34), 1961.
• [7] W.C. Morgan and P.T. Bizon, “Comparison of experimental and theoretical stresses at a mismatch in a circumferential joint in a cylindrical pressure vessel,” Lewis Research Center, Cleveland, Ohio, USA, Technical Note TN-D-3608 (1-17), 1966.
• [8] C. R Steele and J Skogh, “Slope discontinuities in pressure vessels”, J. of app. Mech., 37(3) pp. 587-598, 1970. https://doi.org/10.1115/1.3408584
• [9] J. Skoghand A.M.C. Holmes, “Elastic and plastic stresses at weld sinkages and other discontinuities in pressure vessels,” Palo Alto research laboratory,palo Alto, California, LMSC-4-05-69-7, Oct. 1969.
• [10] Ansys 13.0, Ansys Manual, ANSYS In.
• [11] John F. Harvey .“Theory and design of pressure vessels",Van Nostrand Reinhold Company Inc. New York,USA:ISBN No. 0-442-23248-9,1985.