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Research Papers: Materials Technology

Localized Lateral Thermal Buckling of Pipelines With a Circular Layout

[+] Author and Article Information
Jianbei Zhu

School of Civil and Environmental Engineering,
University of New South Wales,
Sydney, New South Wales 2052, Australia
e-mail: jianbei.zhu@unsw.edu.au

Mario M. Attard

School of Civil and Environmental Engineering,
University of New South Wales,
Sydney, New South Wales 2052, Australia
e-mail: m.attard@unsw.edu.au

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received November 21, 2014; final manuscript received July 26, 2016; published online September 16, 2016. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 138(6), 061401 (Sep 16, 2016) (10 pages) Paper No: OMAE-14-1144; doi: 10.1115/1.4034373 History: Received November 21, 2014; Revised July 26, 2016

A numerical strategy is developed and used to investigate the localized lateral buckling of circular pipelines under thermal loading and friction. The constitutive relations for circular pipelines are derived for thermal stresses and finite strain based on a hyperelastic constitutive model. The prebuckling lateral expansion and localized postbuckling deformation are investigated. A critical included angle for circular profiles is studied. Beyond the critical included angle, increasing the included angle of the pipeline or changing the boundary conditions does not influence the localized buckling behavior. Parametric studies are performed and the results are validated with ansys.

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Figures

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Fig. 1

Geometry of circular pipeline

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Fig. 2

Typical equilibrium paths of circular pipelines

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Fig. 3

Localized buckling of circular pipelines

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Fig. 4

Flowchart to determine the critical included angle

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Fig. 5

Localized lateral buckling for pipelines with circular layout and with different included angles

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Fig. 6

Safe temperature increment versus included angle of pipelines with different outside diameters

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Fig. 7

Absolute difference of the safe temperature increment versus the included angle of pipelines

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Fig. 8

Lateral displacement along the circular pipeline

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Fig. 9

Deformed shapes of circular pipeline

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Fig. 10

Axial compressive force distribution near the center of the pipeline

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Fig. 11

Central axial compressive force versus normalized central lateral displacement

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Fig. 12

Imperfection effects and validation

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Fig. 13

Initial central lateral displacement versus the imperfection parameter

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Fig. 14

Initial central lateral displacement versus limit temperature increment

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Fig. 15

Localized postbuckling of pipelines with different tangential frictions

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Fig. 16

Localized postbuckling of pipelines with different radial frictions

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