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TECHNICAL PAPERS

Effect of Strength Matching and Strain Hardening Capacity on Fracture Performance of X80 Line Pipe Girth Welded Joint Subjected to Uniaxial Tensile Loading

[+] Author and Article Information
Hiroyuki Motohashi

Pipeline Technology Center,  Tokyo Gas Co., Ltd., 1-7-7, Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japanmotohasi@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

J. Offshore Mech. Arct. Eng 129(4), 318-326 (Apr 18, 2007) (9 pages) doi:10.1115/1.2746402 History: Received October 16, 2006; Revised April 18, 2007

By conducting curved wide plate tensile tests for girth welded joints of X80 line pipe containing a surface notch in the weld metal, the effects of strength matching on fracture performance were evaluated. Parametric studies were also conducted using a finite element method simulating the experiments to clarify the effects of strain hardening capacity of the base metal, softening in the heat affected zone, and groove configuration on fracture performance. A strain at failure significantly decreased with the decreasing strength matching. This was expected to be due to a difference in local straining behavior at the notch tip caused by the shielding effect. The analytical studies revealed that the strain hardening capacity of the base metal, the softening in the heat affected zone, and the groove configuration affected the allowable strain for a given toughness level in the case of overmatching. However, these factors hardly affected the allowable strain in the case of undermatching.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Groove configuration

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Figure 2

Hardness of girth welded joints

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Figure 3

Curved wide plate tensile specimen

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Figure 5

Applied load versus gauge length strain

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Figure 6

Relationship between local strain at weld metal and gauge length strain

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Figure 7

Crack mouth opening behavior

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Figure 8

FE mesh for curved, wide plate specimen

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Figure 9

Stress-strain curves for FE analyses

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Figure 10

Comparison of load versus gauge length strain curves between FE analyses and experiments

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Figure 11

Relationship between equivalent plastic strain and gauge length strain

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Figure 12

Relationship between equivalent plastic strain and CTOD

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Figure 13

Stress-strain curves of base metal and weld metal

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Figure 14

Relationship between CTOD crack driving force and gauge length strain

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Figure 15

Effect of Y/T of base metal on allowable strain: (a)M=1.2 (overmatching); (b)M=0.8 (undermatching)

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Figure 16

Effect of UEL of base metal on allowable strain: (a)M=1.2 (overmatching); (b)M=0.8 (undermatching)

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Figure 17

Stress-strain curve having a certain level of yield plateau

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Figure 18

Effect of yield plateau in stress-strain curve of base metal on allowable strain: (a)M=1.2 (overmatching); (b)M=0.8 (undermatching)

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Figure 19

Influence of yield plateau on relationship between gauge length strain and equivalent plastic strain at notch tip for overmatching

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Figure 20

Effects of softening in HAZ on allowable strain as a function of strength matching

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Figure 21

Comparison of opening stress at notch tip

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Figure 22

Effect of bevel angle on allowable strain: (a)M=1.2 (overmatching); (b)M=0.8 (undermatching)

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