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Materials

Effects of Local Metal Loss on Deformability of Line Pipes Subjected to Compressive Load

[+] Author and Article Information
Yoshikazu Hashimoto1

Pipeline Technology Center, Tokyo Gas Co., Ltd., 1-7-7 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japanhashimt@tokyo-gas.co.jp

Naoto Hagiwara

Pipeline Technology Center, Tokyo Gas Co., Ltd., 1-7-7 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japannhagi@tokyo-gas.co.jp

Hiroshi Yatabe

Pipeline Technology Center, Tokyo Gas Co., Ltd., 1-7-7 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japanyatabe-h@tokyo-gas.co.jp

Noritake Oguchi

Pipeline Department, Tokyo Gas Co., Ltd., 1-5-20 Kaigan, Minato-ku, Tokyo, Japanyuri-o@tokyo-gas.co.jp

1

Corresponding author.

J. Offshore Mech. Arct. Eng 130(4), 041401 (Sep 29, 2008) (6 pages) doi:10.1115/1.2426996 History: Received March 07, 2006; Revised September 11, 2006; Published September 29, 2008

In this paper, the deformability of line pipe with local metal loss was examined. A full-scale experiment and a finite element (FE) analysis were carried out for line pipe with local metal loss subjected to an axial compressive load. As a result, a good agreement was obtained between the analytical and experimental results. This indicated that the present analytical method was applicable to evaluate the deformability of line pipes with local metal loss subjected to a large ground movement. Parametric studies were then conducted to clarify the relationship between the geometry of the local metal loss and the deformability using the FE analytical method.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of X42 test pipe

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Figure 2

Experimental setup

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Figure 3

FE mesh and boundary conditions: (a) overview of FE mesh; (b) detail of metal loss; and (c) boundary condition

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Figure 4

Compressive stress–strain curve for FE analysis

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Figure 5

Geometry of test specimen for an axial compression test

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Figure 6

Buckling deformations at peak load strain

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Figure 7

Relationship between load (F) and nominal compression strain (ε)

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Figure 8

Relationship between local axial strain and nominal compressive strain

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Figure 9

Stress–strain curve for parametric studies

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Figure 10

Relationship between peak load strain (εb) and longitudinal length (β)

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Figure 11

Deformation at peak load strain; 2λ=buckling wavelength obtained from Timoshenko’s formula Eq. 1; 2λ=buckling wavelength obtained from FE analysis

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Figure 12

Deformation at peak load strain

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Figure 13

Relationship between peak load strain (εb) and circumferential length (γ)

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