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

Takao Utsunomiya, Takayuki Tanaka, Katsuhiko Watanabe, Toshiaki Ohira

研究成果: Article

1 引用 (Scopus)

抄録

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.

元の言語English
ページ(範囲)620-627
ページ数8
ジャーナルNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
70
発行部数4
出版物ステータスPublished - 2004 4

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

ASJC Scopus subject areas

  • Mechanical Engineering

これを引用

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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.",
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AU - Utsunomiya, Takao

AU - Tanaka, Takayuki

AU - Watanabe, Katsuhiko

AU - Ohira, Toshiaki

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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.

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