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Research Papers: Design and Analysis

Post-Buckling Failure Modes of X65 Steel Pipe: An Experimental and Numerical Study

[+] Author and Article Information
Nima Mohajer Rahbari, J. J. Roger Cheng, Samer Adeeb

Department of Civil and
Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2W2, Canada

Mengying Xia

College of Mechanical and
Transportation Engineering,
China University of Petroleum (Beijing),
Beijing 102249, China;
Department of Civil and
Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2W2, Canada

Xiaoben Liu

College of Mechanical and
Transportation Engineering,
China University of Petroleum (Beijing),
Beijing 102249, China;
Department of Civil and
Environmental Engineering,
University of Alberta,
Edmonton, AB T6G 2W2, Canada
e-mail: liuxiaoben1991@126.com

Millan Sen

Enbridge Pipeline, Inc.,
Edmonton, AB T5J 3N7, Canada

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 17, 2018; final manuscript received August 9, 2018; published online August 31, 2018. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 140(5), 051207 (Aug 31, 2018) (7 pages) Paper No: PVT-18-1080; doi: 10.1115/1.4041198 History: Received April 17, 2018; Revised August 09, 2018

In service pipelines exhibit bending loads in a variety of in-field situation. These bending loads can induce large longitudinal strains, which may trigger local buckling on the pipe's compressive side and/or lead to rupture of the pipe's tensile side. In this article, the post-buckling failure modes of pressurized X65 steel pipelines under monotonic bending loading conditions are studied via both experimental and numerical investigations. Through the performed full-scale bending test, it is shown that the post-buckling rupture is only plausible to occur in the pipe wall on the tensile side of the wrinkled cross section under the increased bending. Based on the experimental results, a finite element (FE)-based numerical model with a calibrated cumulative fracture criterion was proposed to conduct a parametric analysis on the effects of the internal pressure on the pipe's failure modes. The results show that the internal pressure is the most crucial variable that controls the ultimate failure mode of a wrinkled pipeline under monotonic bending load. And the post-buckling rupture of the tensile wall can only be reached in highly pressurized pipes (hoop stress no less than 70% SMYS for the investigated X65 pipe). That is, no postwrinkling rupture is likely to happen below a certain critical internal pressure even after an abrupt distortion of the wrinkled wall on the compressive side of the cross section.

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Figures

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Fig. 1

Schematic test setup

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Fig. 2

Cold bend pipe in the testing frame

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Fig. 3

True stress–strain curve of X65 steel described by power function

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Fig. 4

Mesh description and BC in the FE model

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Fig. 5

X65 fracture locus for plane stress loading condition

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Fig. 6

Comparison of the experimental and numerical load-deformation plots and rupture

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Fig. 7

Comparison of the final deformed configuration and rupture from (a) test and (b) FE simulation

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Fig. 8

Fracture index contour immediately before rupture

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Fig. 9

Load–displacement comparison of the pipe subjected to p/py ratios of 80%, 70%, and 40%

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Fig. 10

Fracture index contour of pipe with p/py ratio of 70% before rupture

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Fig. 11

Compression failure mode and fracture index contour for the pipe with p/py ratio of 40%

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