Brittle-ductile fracture transition on a crack in a weld line between two different steels

Takao Utsunomiya, Takayuki Tanaka, Katsuhiko Watanabe, Toshiaki Ohira

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The fracture experiment of a crack in a weld line between two different steels (SPC and HT 60) was carried out over the temperature range from -196°C to room temperature. Different from a crack in a material, the fracture mode change from mode I (opening) type to mode II (in-plane shearing) type due to the difference of material properties of two steels was observed with the increase of temperature in addition to brittle-ductile transition behavior. That is, in the range below -150°C, only mode I brittle fracture occurred without blunting of a crack tip. In the range from -150°C to -100°C, although a crack tip a little blunted, unstable mode I brittle fracture occurred. In the range from -100°C to -75°C, a crack showed stable mode II ductile fracture first, then, changed to unstable mode I brittle fracture, and, in the range from -75°C to room temperature, a crack showed stable mode II ductile fracture first, then, changed to stable mode I ductile fracture. The CED (crack energy density) in an arbitrary direction were evaluated through the results of finite element analyses corresponding to the fracture experiment. It was shown that a dramatic increase of fracture resistance by brittle-ductile transition cannot be expected for a crack in a weld line between two different steels because brittle-ductile transition is accompanied by fracture mode change from mode I to mode II.

Original languageEnglish
Pages (from-to)620-627
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume70
Issue number4
Publication statusPublished - 2004 Apr

Fingerprint

Ductile fracture
Steel
Brittle fracture
Welds
Cracks
Crack tips
Temperature
Shearing
Fracture toughness
Materials properties
Experiments

Keywords

  • Brittle-Ductile Transition
  • Crack Energy Density
  • Crack in Weld Line
  • Fracture Criterion
  • Fracture Mechanics
  • Fracture Mode Change
  • Welding of Different Steels

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Brittle-ductile fracture transition on a crack in a weld line between two different steels. / Utsunomiya, Takao; Tanaka, Takayuki; Watanabe, Katsuhiko; Ohira, Toshiaki.

In: Nippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 70, No. 4, 04.2004, p. 620-627.

Research output: Contribution to journalArticle

@article{e8d7c022776c4127ac391564181db511,
title = "Brittle-ductile fracture transition on a crack in a weld line between two different steels",
abstract = "The fracture experiment of a crack in a weld line between two different steels (SPC and HT 60) was carried out over the temperature range from -196°C to room temperature. Different from a crack in a material, the fracture mode change from mode I (opening) type to mode II (in-plane shearing) type due to the difference of material properties of two steels was observed with the increase of temperature in addition to brittle-ductile transition behavior. That is, in the range below -150°C, only mode I brittle fracture occurred without blunting of a crack tip. In the range from -150°C to -100°C, although a crack tip a little blunted, unstable mode I brittle fracture occurred. In the range from -100°C to -75°C, a crack showed stable mode II ductile fracture first, then, changed to unstable mode I brittle fracture, and, in the range from -75°C to room temperature, a crack showed stable mode II ductile fracture first, then, changed to stable mode I ductile fracture. The CED (crack energy density) in an arbitrary direction were evaluated through the results of finite element analyses corresponding to the fracture experiment. It was shown that a dramatic increase of fracture resistance by brittle-ductile transition cannot be expected for a crack in a weld line between two different steels because brittle-ductile transition is accompanied by fracture mode change from mode I to mode II.",
keywords = "Brittle-Ductile Transition, Crack Energy Density, Crack in Weld Line, Fracture Criterion, Fracture Mechanics, Fracture Mode Change, Welding of Different Steels",
author = "Takao Utsunomiya and Takayuki Tanaka and Katsuhiko Watanabe and Toshiaki Ohira",
year = "2004",
month = "4",
language = "English",
volume = "70",
pages = "620--627",
journal = "Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A",
issn = "0387-5008",
publisher = "Japan Society of Mechanical Engineers",
number = "4",

}

TY - JOUR

T1 - Brittle-ductile fracture transition on a crack in a weld line between two different steels

AU - Utsunomiya, Takao

AU - Tanaka, Takayuki

AU - Watanabe, Katsuhiko

AU - Ohira, Toshiaki

PY - 2004/4

Y1 - 2004/4

N2 - The fracture experiment of a crack in a weld line between two different steels (SPC and HT 60) was carried out over the temperature range from -196°C to room temperature. Different from a crack in a material, the fracture mode change from mode I (opening) type to mode II (in-plane shearing) type due to the difference of material properties of two steels was observed with the increase of temperature in addition to brittle-ductile transition behavior. That is, in the range below -150°C, only mode I brittle fracture occurred without blunting of a crack tip. In the range from -150°C to -100°C, although a crack tip a little blunted, unstable mode I brittle fracture occurred. In the range from -100°C to -75°C, a crack showed stable mode II ductile fracture first, then, changed to unstable mode I brittle fracture, and, in the range from -75°C to room temperature, a crack showed stable mode II ductile fracture first, then, changed to stable mode I ductile fracture. The CED (crack energy density) in an arbitrary direction were evaluated through the results of finite element analyses corresponding to the fracture experiment. It was shown that a dramatic increase of fracture resistance by brittle-ductile transition cannot be expected for a crack in a weld line between two different steels because brittle-ductile transition is accompanied by fracture mode change from mode I to mode II.

AB - The fracture experiment of a crack in a weld line between two different steels (SPC and HT 60) was carried out over the temperature range from -196°C to room temperature. Different from a crack in a material, the fracture mode change from mode I (opening) type to mode II (in-plane shearing) type due to the difference of material properties of two steels was observed with the increase of temperature in addition to brittle-ductile transition behavior. That is, in the range below -150°C, only mode I brittle fracture occurred without blunting of a crack tip. In the range from -150°C to -100°C, although a crack tip a little blunted, unstable mode I brittle fracture occurred. In the range from -100°C to -75°C, a crack showed stable mode II ductile fracture first, then, changed to unstable mode I brittle fracture, and, in the range from -75°C to room temperature, a crack showed stable mode II ductile fracture first, then, changed to stable mode I ductile fracture. The CED (crack energy density) in an arbitrary direction were evaluated through the results of finite element analyses corresponding to the fracture experiment. It was shown that a dramatic increase of fracture resistance by brittle-ductile transition cannot be expected for a crack in a weld line between two different steels because brittle-ductile transition is accompanied by fracture mode change from mode I to mode II.

KW - Brittle-Ductile Transition

KW - Crack Energy Density

KW - Crack in Weld Line

KW - Fracture Criterion

KW - Fracture Mechanics

KW - Fracture Mode Change

KW - Welding of Different Steels

UR - http://www.scopus.com/inward/record.url?scp=3142533145&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3142533145&partnerID=8YFLogxK

M3 - Article

VL - 70

SP - 620

EP - 627

JO - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A

JF - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A

SN - 0387-5008

IS - 4

ER -