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RESEARCH PAPERS

Failure of Locally Buckled Pipelines

[+] Author and Article Information
E. Dama

Department of Mechanical & Industrial Engineering,  University of Thessaly, Volos, Greece

S. A. Karamanos1

Department of Mechanical & Industrial Engineering,  University of Thessaly, Volos, Greeceskara@mie.uth.gr

A. M. Gresnigt

Faculty of Civil Engineering and Geosciences,  Delft University of Technology, Delft, The Netherlandsa.m.gresnigt@citg.tudelft.nl

1

Corresponding author.

J. Pressure Vessel Technol 129(2), 272-279 (Jul 17, 2006) (8 pages) doi:10.1115/1.2716431 History: Received January 19, 2006; Revised July 17, 2006

Mechanical damage in steel pipelines in the form of local buckles due to excessive bending deformation may severely threaten their structural integrity. The present paper describes experimental and numerical research conducted to assess the structural condition of buckled pipes, subjected to both bending and internal pressure. Fatigue failure under repeated loading is mainly investigated, whereas pipe burst due to internal pressure is also examined. Three full-scale buckled pipe specimens are tested under pressure and bending loads to determine their structural capacity. In addition, using nonlinear finite element tools, an extensive parametric study is conducted to determine the critical locations at the buckled area at which maximum strain variation occurs, as well as to investigate the influence of several geometrical and mechanical parameters. Using the maximum strain range from the finite element computations and a simple S-N approach, reasonable predictions are obtained for the number of cycles to failure observed in the tests. The results of the present study demonstrate that, under repeated loading, fatigue failure occurs in the buckled area at the location of maximum strain range. It is also found that the burst pressure may not be affected by the presence of buckles.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental setup with four-point bending equipment

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Figure 2

Schematic representation of four-point bending experimental set-up

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Figure 3

(a) Buckled shape of pipe in test specimen 1 before fatigue loading and strain gauge locations; (b) through-thickness fatigue crack at the “ridge” of the buckle in the circumferential pipe direction

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Figure 4

Buckled shape of pipe in test specimen 2 before fatigue loading and location of strain gauges; fatigue crack in longitudinal direction occurred near strain gauge e4

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Figure 5

(a) Buckled specimen 3 before cyclic and burst loading (b) under pressure testing: buckles nearly disappeared; (c) burst in specimen 3: crack is not at the buckled area

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Figure 6

Finite element mesh used in the numerical model; denser mesh is used around the middle cross section where buckle is forced to occur

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Figure 7

Numerically obtained buckled shapes (a) test specimen 1 and 2, (b) test specimen 3

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Figure 8

Test specimen 3 (a) before application of internal pressure and (b) after application of pressure near burst

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