Table of Contents
Conference Papers in Energy
Volume 2013 (2013), Article ID 267095, 10 pages
http://dx.doi.org/10.1155/2013/267095
Conference Paper

A Finite Element Approach for the Elastic-Plastic Behavior of a Steel Pipe Used to Transport Natural Gas

Department of Mathematics and Statistics, University of Cyprus, P.O. Box 24908, 1305 Nicosia, Cyprus

Received 14 March 2013; Accepted 28 April 2013

Academic Editors: P. Demokritou, A. Poullikkas, and C. Sourkounis

This Conference Paper is based on a presentation given by Miltiades C. Elliotis at “Power Options for the Eastern Mediterranean Region” held from 19 November 2012 to 21 November 2012 in Limassol, Cyprus.

Copyright © 2013 Miltiades C. Elliotis. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A finite element technique, with two-dimensional isoparametric elements, is developed, for the analysis of a steel pipe, with a circular cross-section. The pipe is installed above the ground and is used to transport natural gas at very high pressures. The material of the pipe is assumed to obey a bilinear elastic-plastic model. Double symmetry is considered when setting up the mathematical model problem and creating the finite element mesh. Step increments or decrements on the internal pressure are applied (cyclic loading). Yielding is detected by the Von Mises yield criterion. Also, a flow rule is employed to handle the plastic strain component. A four-point Gauss-Legendre quadrature is used to numerically perform all necessary integrations. Finally, the so-called “shakedown phenomenon” is studied when cyclic loading is applied after the commencement of plastic deformations on the pipe. Numerical results obtained by the method compare favorably with the analytic solution.