Curved thin shell buckling behaviour

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

Abstrakty

EN

Purpose: The aim of the paper is to evaluate buckling instabilities behaviour of long curved thin shell. Both initially straight and curved tubes are investigated with numerical and experimental assessment methods, in the context of NPP applications with an illustrative example for IRIS LWR integrated Steam Generator (SG) tubes. Design/methodology/approach: In this study structural buckling response tube with combination effects of geometric imperfections as well as initially bent shape under external pressure load are investigated using a non linear finite element (MSC.MARC FEM code) formulation analysis. Moreover results are presented, extending the findings of previous research activity works, carried out at Pisa University, on thin walled metal specimen. Findings: The experiments were conducted on Inconel 690 test specimen tube. 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 and bending instabilities 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; tube; pressure; load; deformation

PL

techniki numeryczne; rura; ciśnienie; obciążenie; deformacja

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 23, nr 2
• Strony: 55--58
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Forasassi G.

autor

Lo Frano R.

• Department of Mechanical, Nuclear and Production Engineering, University of Pisa, Via Diotisalvi, no 2-56126 Pisa, Italy,

Bibliografia

• [1] S.P. Timoshenko, J.M. Gere, Theory of elastic stability, Chapter 10, McGraw-Hill Book, New York, 1961.
• [2] 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 230 (2004) 151-167.
• [3] 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 (2005) 175-188.
• [4] 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 Composite Materials 36/21 (2002) 2443-2478.
• [5] X. Wang, J. Xiao, Y.C. Zhang, A method solving the buckling problem of thin-walled shell, International Journal of Pressure Vessel and Piping 81 (2004) 907-912.
• [6] G. Forasassi, R. Lo Frano, Buckling of imperfect cylindrical shell under lateral pressure, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 287-290.
• [7] G. Forasassi, R. Lo Frano, Buckling of thin cylindrical shell subject to uniform external pressure, Proceedings of the International Congress on Advanced in Nuclear Power Plant ICAPP'06, Reno, 2006.
• [8] S.A. Karamanos, Bending instabilities of elastic tubes, International Journal of Solids and Structures 39 (2002) 2059-2085.