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RESEARCH PAPERS: Offshore Mechanics

Bifurcation Buckling Versus Limit Load Instabilities of Elastic-Plastic Tubes Under Bending and External Pressure

[+] Author and Article Information
G. T. Ju, S. Kyriakides

Engineering Mechanics Research Laboratory, Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, TX 78712

J. Offshore Mech. Arct. Eng 113(1), 43-52 (Feb 01, 1991) (10 pages) doi:10.1115/1.2919895 History: Received March 20, 1990; Revised August 07, 1990

Abstract

Commonly used procedures for installing offshore pipelines can induce substantial bending to the line in the presence of external pressure. These combined loads can lead to catastrophic collapse of the structure. For typically used steels and higher diameter-to-thickness ratios (D/t ), bending is limited by a bifurcation type of instability; for lower D/t values, the structures exhibit limit load types of instabilities. Similar distinctions can be made for bending in the presence of external pressure. Previous work (Corona and Kyriakides, 1988) addressed primarily the limit load types of instabilities. In this paper, this analysis is extended to include bifurcation instabilities. The predictions from the two types of analyses are critically compared to experimental results and recommendations about the regime of applicability of each are made.

Copyright © 1991 by The American Society of Mechanical Engineers
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