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Research Papers: Design and Analysis

Inverse Fracture in DWTT and Brittle Crack Behavior in Large-Scale Brittle Crack Arrest Test

[+] Author and Article Information
Tetsuya Tagawa

Steel Research Laboratory,
JFE Steel Corporation,
1 Kawasaki-cho, Chuo-ku,
Chiba 260-0835, Japan
e-mail: t-tagawa@jfe-steel.co.jp

Toshihiko Amano

Steel Research Laboratories,
Nippon Steel & Sumitomo Metal Corporation,
1-8 Fuso-cho,
Amagasaki 660-0891, Japan
e-mail: amano.4bf.toshihiko@jp.nssmc.com

Takashi Hiraide

Steel Research Laboratory,
JFE Steel Corporation,
1 Kawasaki-cho, Chuo-ku,
Chiba 260-0835, Japan
e-mail: t-hiraide@jfe-steel.co.jp

Takahiro Sakimoto

Steel Research Laboratory,
JFE Steel Corporation,
1 Kawasaki-cho, Chuo-ku,
Chiba 260-0835, Japan
e-mail: t-sakimoto@jfe-steel.co.jp

Satoshi Igi

Steel Research Laboratory,
JFE Steel Corporation,
1 Mizushima Kawasaki-dori,
Kurashiki 712-8511, Japan
e-mail: s-igi@jfe-steel.co.jp

Taishi Fujishiro

Steel Research Laboratories,
Nippon Steel & Sumitomo Metal Corporation,
1-8 Fuso-cho,
Amagasaki 660-0891, Japan
e-mail: fujishiro.kd2.taishi@jp.nssmc.com

Takuya Hara

Steel Research Laboratories,
Nippon Steel & Sumitomo Metal Corporation,
1-8 Fuso-cho,
Amagasaki 660-0891, Japan
e-mail: hara.q6m.takuya@jp.nssmc.com

Takehiro Inoue

Material Properties Evaluation Division,
Nippon Steel & Sumikin Technology Co.,
20-1 Shintomi,
Futtsu 293-8511, Japan
e-mail: inoue.q3q.takehiro@jp.nssmc.com

Shuji Aihara

Department of Systems Innovation,
The University of Tokyo,
7-3-1, Hongo, Bunkyo,
Tokyo 113-8656, Japan
e-mail: aihara@fract.t.u-tokyo.ac.jp

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 15, 2018; final manuscript received June 8, 2018; published online August 2, 2018. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 140(5), 051205 (Aug 02, 2018) (9 pages) Paper No: PVT-18-1042; doi: 10.1115/1.4040641 History: Received February 15, 2018; Revised June 08, 2018

The drop weight tear test (DWTT) has been widely used to evaluate the resistance of linepipe steels against brittle fracture propagation. Although there is an ambiguity in the evaluation of DWTT results if inverse fracture appears on the fracture surfaces, the cause of inverse fracture is not yet fully understood. In the present work, DWTTs were performed with X65, X70, and X80 steel linepipes. In addition to the conventional DWTT specimen with a pressed notch (PN), PN specimens with a back slot (BS) and specimens with a chevron notch (CN) or static precrack (SPC) were also examined, and the fracture appearances in different strengths and different initial notch types were compared. Although the frequency of inverse fracture in these DWTTs was different with each material and each specimen type, there was no material or specimen type that was entirely free from inverse fracture. The purpose of the DWTT is to evaluate the brittle crack arrestability of the material in a pressurized linepipe. Therefore, the DWTT results should be examined with a running brittle crack arrest (BCA) test. A large-scale BCA test with temperature gradient was also performed with the X65 mother plate, and the shear area fraction measured in the DWTT fracture surface was compared with the local shear lip thickness fraction in the BCA test. Based on the results, the count of inverse fracture in the DWTT was discussed in comparison with the long BCA behavior in the BCA test.

Copyright © 2018 by ASME
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References

Maxey, W. A. , Kiefner, J. F. , and Eiber, R. J. , 1983, “ Brittle Fracture Arrest in Gas Pipelines,” Line Pipe Research, American Gas Association, Washington, DC, Catalog No. L51436, NG-18 Report No. 135.
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API, 2014, “Recommended Practice for Conducting Drop Weight Tear Test on Line Pipe,” 4th ed., American Petroleum Institute, Washington, DC, Standard No. API RP 5 L 3.
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Iwasaki, N. , Yamaguchi, T. , and Taira, T. , 1975, “ Characteristics of Drop-Weight Tear Test on Line Pipe Steels,” Mechanical Working and Steel Processing XIII: 17th Mechanical Working & Steel Processing Conference, Pittsburgh, PA, Jan. 22–23, pp. 294–314.
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Wilkowski, G. M. , and Eiber, R. J. , 1979, “ Problems in Using the Charpy & DWTT for High Toughness Q&T Steels,” What Does Charpy Energy Really Tell Us?, A. R. Rosenfield , ed., American Society for Metal, Metals Park, OH, pp. 201–226.
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Figures

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Fig. 1

Schematic drawings of four types DWTT specimens: (a) PN (prescription in API RP 5 L 3), (b) pressed notch with back slot (PN with BS), (c) CN (prescription in API RP 5 L 3), and (d) SPC

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Fig. 2

Specimen setup and cleavage trigger procedure in temperature gradient brittle crack arrest test: (a) specimen setup, (b) notch detail, and (c) cleavage trigger

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Fig. 3

Macroscopic fracture appearances in PN-DWTT of pipe A and S.A. transition curve

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Fig. 4

Macroscopic fracture appearances in PN-DWTT of pipe B and S.A. transition curve

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Fig. 5

Macroscopic fracture appearances in PN-DWTT of pipe C and S.A. transition curve

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Fig. 6

Macroscopic fracture appearances in PN-DWTT of plate D and S.A. transition curve

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Fig. 7

Comparison of PN-DWTT results and CN-DWTT results: (a) S.A. transition curves of pipe B and (b) S.A. transition curves of pipe C and representative fracture appearances

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Fig. 8

Comparison of PN-DWTT results and SPC-DWTT results of pipe B (X70): (a) S.A. transition curves for t = 19 mm and (b) S.A. transition curves for t = 25 mm and representative fracture appearances

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Fig. 9

Variation of S.A. transition curves and fracture surfaces when back slot is applied: (a) S.A. transition curves of pipe A (X70) and fracture appearances with inverse fracture and (b) S.A. transition curves of pipe C (X80)

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Fig. 10

SEM fractographs around cleavage trigger in inverse fractured region. (pipe A).

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Fig. 11

SEM fractographs around cleavage trigger in inverse fractured region (pipe B)

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Fig. 12

Measured temperature gradient profile and side view of specimen after crack arrest in brittle crack arrest test

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Fig. 13

Fracture appearance in temperature gradient brittle crack arrest test

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Fig. 14

Temperature dependency of shear lip line fraction, SL in brittle crack arrest test, and comparison with S.A. % in DWTT

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Fig. 15

Arrested crack tip front shapes in different tensile test stresses

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Fig. 16

Temperatures at arrested crack tip in temperature gradient brittle crack arrest tests and comparison with DWTT S.A. % transition curve

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