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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 102
PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by:
Paper 216

Plastic Buckling for Pressure Vessel Ends subjected to Corrosion Wall Thinning

J. Blachut

School of Engineering, The University of Liverpool, United Kingdom

Full Bibliographic Reference for this paper
J. Blachut, "Plastic Buckling for Pressure Vessel Ends subjected to Corrosion Wall Thinning", in , (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 216, 2013. doi:10.4203/ccp.102.216
Keywords: corroded domes, external pressure, vacuum, bifurcation buckling, collapse.

Summary

  1. corrosion confined to the knuckle, and
  2. corrosion spanning evenly the knuckle and spherical parts.

In both cases the meridional extent of the corrosion is varied. This allows the identification of the worst position and size of the corroded area (i.e., leading to the largest reduction of buckling strength). Loss of buckling strength is measured against a perfect (non-corroded) head. Numerical results indicate that the following factors influence buckling performance of the dome:

  • meridional position of corroded area,
  • depth of corrosion itself, and
  • meridional span of corroded wall.

For example, wall thinning of 10 %, over 10 % of the meridional length causes almost a 20 % drop in buckling strength. The largest drop of in load carrying capacity is found when the corroded wall is at the knuckle/crown junction. It is shown that collapse pressure overestimates the load carrying capacity by 40 %. Hence it is erroneous to rely on the magnitude of the collapse pressure, only when assessing the performance of corroded torispheres.

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