Some innovative nuclear power plant proposals consider for the design tubes of considerable thickness subjected to external pressure (e.g., steam generators tubes). The collapse of thick tubes is expected to be dominated by yielding but, because of the decreasing nature of the postcollapse evolution, interaction with buckling is likely to be significant enough to demand consideration. At the present, few studies have been carried out both experimentally and numerically, as witnessed by the really conservative attitude that codes assume for thick tubes. A numerical investigation has been performed in this context at the Politecnico di Milano, which was originally intended as a support for requesting a relaxation of American Society of Mechanical Engineers (ASME) regulations. Actually, in 2007, ASME code case N-759 was approved, permitting significant thickness saving in the tube design. Nevertheless, the numerical investigation was pursued to assess the influence of different parameters, such as eccentricity, initial stresses, and material hardening, on the collapse of tubes with diameter to thickness ratios . Results are thought to be useful under at least two respects: first, providing some understanding on the collapse behavior in a thickness range so far unexplored; second, giving an indication on the assumptions on which computer codes ought to be based when numerical analyses are required.
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February 2011
Research Papers
Collapse of Nuclear Reactor SG Tubes Pressurized From Outside: The Influence of Imperfections
Lelio Luzzi,
Lelio Luzzi
Department of Energy, Enrico Fermi Center for Nuclear Studies, CeSNEF,
Politecnico di Milano
, Via Ponzio 34/3, Milano 20133, Italy
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Valentino Di Marcello
Valentino Di Marcello
Department of Energy, Enrico Fermi Center for Nuclear Studies, CeSNEF,
e-mail: valentino.dimarcello@mail.polimi.it
Politecnico di Milano
, Via Ponzio 34/3, Milano 20133, Italy
Search for other works by this author on:
Lelio Luzzi
Department of Energy, Enrico Fermi Center for Nuclear Studies, CeSNEF,
Politecnico di Milano
, Via Ponzio 34/3, Milano 20133, Italy
Valentino Di Marcello
Department of Energy, Enrico Fermi Center for Nuclear Studies, CeSNEF,
Politecnico di Milano
, Via Ponzio 34/3, Milano 20133, Italye-mail: valentino.dimarcello@mail.polimi.it
J. Pressure Vessel Technol. Feb 2011, 133(1): 011206 (6 pages)
Published Online: December 23, 2010
Article history
Received:
November 4, 2009
Revised:
September 21, 2010
Online:
December 23, 2010
Published:
December 23, 2010
Citation
Luzzi, L., and Di Marcello, V. (December 23, 2010). "Collapse of Nuclear Reactor SG Tubes Pressurized From Outside: The Influence of Imperfections." ASME. J. Pressure Vessel Technol. February 2011; 133(1): 011206. https://doi.org/10.1115/1.4002769
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