Buckling of imperfect thin cylindrical shell under lateral pressure

• Autorzy: Forasassi G. , Lo Frano R.
• Języki publikacji: EN

Abstrakty

EN

Purpose: This paper investigates buckling behaviour of imperfect thin cylindrical shell with analytical and experimental assessment methods, in the context of NPP applications as, for instance, the IRIS LWR integrated Steam Generator (SG) tubes. Design/methodology/approach: In this paper, thin shell, homogeneous and isotropic material, also tube geometric imperfections as eccentricity/ovality/welding are assumed to investigate the effects of latter on the limit pressure load in conditions for which, at present, a complete theoretical analysis was not found in literature. At Pisa University a research activity is being carried out on the buckling of thin walled metal specimen, with a test equipment (and the necessary data acquisition facility), suitable for carrying out test series on this issue, as well as numerical models implemented on the MARC FEM code, were set up. Findings: The experiments were conducted on test specimens of the same material (AISI 316) tube with and without longitudinal welding. The comparison between numerical and experimental results, for the same geometry and loading conditions, shows a good agreement between the elastic-plastic finite-element predictions and the experimental data. Research limitations/implications: The presented research results may be considered preliminary in the sense that it would be important to enlarge the statistical base of the results themselves, even if they are yet certainly meaningful to highlight the real problem, considering the relatively large variability of the geometrical imperfections also in high quality production tubes. Originality/value: From the point of view of the practical implication, besides the addressed problem general interest in industrial plant technology, it is worth to stress that straight and curved axis tubes are foreseen specifically in innovative nuclear reactors SG design

Słowa kluczowe

EN

numerical techniques; cylindrical shell; buckling; lateral pressure

PL

techniki numeryczne; powłoka cylindryczna; wyboczenie; nacisk boczny

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 18, nr 1-2
• Strony: 287--290
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Forasassi G.

• Department of Mechanical, Nuclear and Production Engineering, University of Pisa, Via Diotisalvi, n°2-56126 Pisa, Italy

autor

Lo Frano R.

• Department of Mechanical, Nuclear and Production Engineering, University of Pisa, Via Diotisalvi, n°2-56126 Pisa, Italy

Bibliografia

• [1] N. Yamaki, Elastic Stability of cylindrical shell, Chapter 3, North Holland, Amsterdam (1984).
• [2] S.P. Timoshenko and J.M. Gere, Theory of elastic stability, Chapter 10, McGraw-Hill Book, New York (1961).
• [3] T.D. Park and S. Kyriakides, “On the collapse of dented cylinders under external pressure”, Int. J. Mech. Sci. v. 38, No. 5, pp. 557-578 (1996).
• [4] Y. Bai, R.T. Igland, T. Moan, “Tube Collapse Under Combined External Pressure, Tension and Bending”, Marine Structures, v. 10, 389-410(1997)
• [5] M.D. Carelli, L.E. Conway, L. Oriani, B. Petrovic et al., ”The design and safety features of the IRIS reactor”, Nuclear Engineering and Design, v. 230, 151– 167 (2004).
• [6] W. Schneider, A. Brede, ”Consistent equivalent geometric imperfections for the numerical buckling strength verification of cylindrical shells under uniform external pressure, Thin-Walled Structures 43 175–188 (2005).
• [7] R.K.H. Ng, A. Yousefpour, M. Uyema and M.N. Ghasemi Nejhad, “Design, Analysis, Manufacture, and Test of Shallow Water Pressure Vessels Using E-Glass/Epoxy Woven Composite Material for a Semi-Autonomous Underwater Vehicle”, Journal of composite Materials, v. 36, No. 21/2002.
• [8] X.K. Zhu, B.N. Leis “Plastic Collapse Assessment Method For Unequal Wall Transition Joints in Transmission Pipelines”, Journal of Pressure Vessel Technology, v. 127, November 2005.
• [9] X. Wang, J. Xiao, Y.C. Zhang, “A method solving the buckling problem of thin-walled shell”, International Journal of Pressure Vessel and Piping, v. 81, 907-912 (2004).