0
research-article

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
t-tagawa@jfe-steel.co.jp

Toshihiko Amano

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

Takashi Hiraide

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

Takahiro Sakimoto

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

Satoshi Igi

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

Taishi Fujishiro

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

Takuya Hara

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

Takehiro Inoue

Material Properties Evaluation Division, Nippon Steel & Sumikin Technology Co., 20-1 Shintomi, Futtsu, 293-8511
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
aihara@fract.t.u-tokyo.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4040641 History: Received February 15, 2018; Revised June 08, 2018

Abstract

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 and specimens with a chevron notch (CN) or static pre-crack (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 test. A large-scale brittle crack arrest 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 brittle crack arrest test. Based on the results, the count of inverse fracture in the DWTT was discussed in comparison with the long brittle crack arrest behavior in the brittle crack arrest test.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In