Effect of Elliptic and Semi-oval Cross Sections on Collapse Load under In-plane Opening Moment and Internal Pressure

[S. Vijayaragavan,T. Christo Michael] Volume 1: Issue 2, April 2014

A comparison between pipe bends with assumed cross sections, namely elliptic and semi oval to include ovality along with wall thinning was performed to determine the plastic collapse load under in-plane opening bending moment and an internal pressure of 4 MPa using finite element limit analysis based on an elastic-perfectly plastic material considering geometric nonlinearity. Twice-elastic-slope method was used to obtain collapse load from the moment-rotation curve drawn for each pipe bend model considered. The effect of ovality on collapse load is significant and higher for elliptic cross sections for the geometry considered while the thinning effect is negligible for both the cross sections. The study concludes that the use of elliptic cross section is suitable for analyzing pipe bend with ovality.
Index Terms:-
pipe bend, elliptic, semi-oval, twice-elastic-slope, ovality, thinning.
[1]A. R. Veerappan, and S. Shanmugam, ―Analysis for flexibility in the ovality and thinning limits of pipe bends,‖ ARPN J Engng Appl Sci, 3(1), pp. 31–41, 2008.
[2] Y. J. Kim, N. H. Kim, C.Y. Oh, and C.S. Oh, ―A method to estimate plastic loads for elbows with non-uniform thicknesses,‖ Fatigue Fract Engng Mater Struct, 31, pp. 822–37, 2008.
[3]] V. Dan, ―The influence of the initial ovality tolerance on the nonlinear cycling analysis of piping bends,‖ J Pressure Vessel Technol, 131, 041203-1– pp. 3-7, 2009.
[4] J. T. Boyle, and J. A. Spence, ―Simple stress analysis for outof –round pressurized pipe bends,‖ Int J Press Vessel Pip, 9, pp. 251–61, 1981.
[5]T. Christo Michael, A. R. Veerappan, and S. Shanmugam, ―Effect of ovality and variable wall thickness on collapse loads in pipe bends subjected to in-plane bending closing moment,‖ Engng Fract Mech, 79, pp. 138-48, 2012.
To view full paper, Download here .

Our Publishers


About this journal

Print ISSN
Abstracted and indexed in
  1. Open Access
  2. Crossref.com
  3. Academia.edu
  4. Google Scholar
  5. J-Gate
  6. Cite Factor
  7. MIAR
  9. Scientific Indexing Services
  10. IFSIJ
  11. COSMOS
  12. JournalIndex.net
  13. International Innovative Journal Impact Factor (IIJIF)
  14. International Journal Impact Factor
  15. ROAD
  16. DRJI
  17. Research Gate
  18. International Scientific Indexing (ISI)
  19. Scilit