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TECHNICAL PAPERS

Effect of Prestrain on Tensile and Fracture Toughness Properties of Line Pipes

[+] Author and Article Information
Naoki Fukuda, Tomoki Masuda

Pipeline Technology Center, Tokyo Gas Co., Ltd., 1-7-7, Suehiro-cho, Tsurumi-ku, Yokohama, 230-0045, Japan Tel: 81-45-505-7309 Fax: 81-45-521-1451

Naoto Hagiwara

Pipeline Technology Center, Tokyo Gas Co., Ltd., 1-7-7, Suehiro-cho, Tsurumi-ku, Yokohama, 230-0045, Japan Tel: 81-45-505-7309 Fax: 81-45-521-1451nhagi@tokyo-gas.co.jp

J. Offshore Mech. Arct. Eng 127(3), 263-268 (Jan 30, 2005) (6 pages) doi:10.1115/1.1894405 History: Received February 12, 2004; Revised January 30, 2005

To investigate the mechanical properties of pipeline subjected to plastic deformation, tensile tests and crack-tip-opening displacement (CTOD) tests were conducted on X60, X65, and X80 line pipe steels with uniaxial tensile or compressive prestrain, εpr. The tensile tests revealed that the Bauschinger effect and work hardening were dependent on the yield-to-tensile ratio (YT) of the steels; the change in yield stress due to prestrain linearly depended on the YT of the base metal. A critical CTOD for crack initiation decreased with increasing εpr. Compressive prestrain had a larger effect on the reduction of the critical CTOD than tensile prestrain. The test results showed that the reduction in the critical CTOD due to tensile prestrain was predictable with a simplified theoretical model employing a critical fracture strain of the base metal.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry of sample for prestraining and tensile testing

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Figure 3

Stress–strain relationship for Steel C with 3% and −3% prestrain without strain aging

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Figure 4

Relationship between the percentage of prestrain (εpr) and yield stress of line pipe steels without strain aging

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Figure 5

Relationship between the percentage of prestrain (εpr) and yield-to-tensile ratio (Y∕T) of steels without strain aging

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Figure 6

Relationship between Y∕T of base metal and the change in yield stress due to prestrain

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Figure 7

Strain aging effect on yield stress of prestrained Steel A (m stands for month)

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Figure 8

Strain aging effect on yield stress of prestrained Steel C (m stands for month)

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Figure 9

Prestrain dependence of critical CTOD at 0°C (steels were aged at RT for a month)

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Figure 10

Prestrain dependence of normalized critical CTOD at 0°C (steels were aged at RT for a month)

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Figure 11

Effect of artificial aging on critical CTOD

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Figure 12

The applicability of the simplified theoretical model to the experimental results

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