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TECHNICAL PAPERS

Evaluation of Leak-Before-Break (LBB) Behavior For Axially Notched X65 and X80 Line Pipes

[+] Author and Article Information
Shinobu Kawaguchi, Naoto Hagiwara, Tomoki Masuda

Pipeline Technology Center, Tokyo Gas Co., Ltd., 1-7-7, Suehiro-cho, Tsurumi-ku, Yokohama, Japan

Masao Toyoda

Dept. of Manufacturing Science, Osaka Univ. 2-1, Yamada-oka, Suita, Osaka, Japan

J. Offshore Mech. Arct. Eng 126(4), 350-357 (Mar 07, 2005) (8 pages) doi:10.1115/1.1834619 History: Received March 01, 2003; Revised March 01, 2004; Online March 07, 2005
Copyright © 2004 by ASME
Topics: Pipes , Stress , Equations
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References

Figures

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Temperature transition curves for CVN energy and shear area percent with major fracture surfaces for X80-D
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An illustration for an axial through-wall notch (units in mm)
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Internal patch for through-wall notch tests
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Setting up of d-c EP measurement
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An illustration for an axial part-through-wall notch (units in mm)
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Typical fractured pipe after TW notch test
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(a) Fracture surfaces of the X65 pipes; (b) Fracture surfaces of the X80 pipes
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Determination of the hoop stress for ductile crack initiation based on d-c EP data from Probe A when initial notch length was 400 mm for X65-A
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The relationship between the axial TW notch length and hoop stress of the test pipe when the initial notch length was 400 mm for X65-A
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Determination of the LBB criterion for the initial TW notch length from full-scale test results for X65-A
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(a) The relationship between the initial TW notch length and normalized stress for the X65 pipes; (b) The relationship between the initial TW notch length and normalized stress for the X80 pipes
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Fractured pipes of part-through-wall (PTW) notch tests for X80-D
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Measured ductile crack velocity and decompression behavior for the PTW notch test resulting in rupture (Case 1)
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The correlation between Gc from the TW notch test results and Cv/Ac
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(a) Instrumented Charpy test results for the X65 pipes; (b) Instrumented Charpy test results for the X80 pipes

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