Limit Loads for Pipe Elbows With Internal Pressure Under In-Plane Closing Bending Moments

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

ECG Engineering Consultants Group, Piping Department, Cairo, Egypt

M. Y. A. Younan

The American University in Cairo, Engineering Department, P.O. Box 2511, Cairo, Egypt 11511

J. Pressure Vessel Technol 120(1), 35-42 (Feb 01, 1998) (8 pages) doi:10.1115/1.2841882 History: Received March 18, 1997; Revised August 01, 1997; Online February 11, 2008


The purpose of this study is to determine limit loads for pipe elbows subjected to in-plane bending moments that tend to close the elbow (i.e., decrease its radius of curvature), and the influence of internal pressure on the value of the limit load. Load-deflection curves were obtained, and from these curves plastic collapse or instability loads at various values of internal pressure were determined. This was done for different pipe bend factors (h = Rt/r2 ) using the nonlinear finite element analysis code (ABAQUS) with its special elbow element. The limit load was found to increase and then decrease with increasing pressure for all the elbow geometries studied.

Copyright © 1998 by The American Society of Mechanical Engineers
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