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RESEARCH PAPERS

Effect of Internal Pressure on Elastic-Plastic Behavior of Pipe Elbows Under In-Plane Bending Moments

[+] Author and Article Information
M. A. Shalaby

Mechanical Engineering Department, Queens University at Kingston, Kingston, Ontario K7M 1B5, Canada

M. Y. A. Younan

Engineering Department, American University in Cairo, 113 Kasr el Aini Street, P.O. 2511, Cairo 11511, Egypt

J. Pressure Vessel Technol 121(4), 400-405 (Nov 01, 1999) (6 pages) doi:10.1115/1.2883722 History: Received March 19, 1999; Revised August 09, 1999; Online February 11, 2008

Abstract

The purpose of this study is to investigate the effect of pressure on the strain and stress analysis of pipe elbows subjected to in-plane bending moments. A finite element model for the bend was constructed and loaded with a pressure of 1200 psi and end moments taking geometric and material nonlinearities into account using (ABAQUS) nonlinear finite element code. The pressure changes the effective stress distribution and location of the initial yielding from the inside surface of the elbow crown to the outside surface for the closing moment case and increases the moment of yielding. For the opening moment case, yielding starts at the inside surface of the elbow crown with and without pressure. The pressure changes the location of the maximum axial strain at instability for the closing and opening cases, and it also changes the ovality of the cross section in both cases.

Copyright © 1999 by The American Society of Mechanical Engineers
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