Growth behavior of a crack parallel to a weld line between two different steels (effect of crack position on fracture mode)

Takao Utsunomiya, Hayato Oku, Katsuhiko Watanabe, Toshiaki Ohira

Research output: Contribution to journalArticle

Abstract

It was shown previously that a crack in a weld line between two different steels may cause mode II type fracture, even under so-called mode I type loading, due to the difference of material properties. In this study, the fracture experiments of the specimen in which a crack parallel to a weld line between high-tension steel and mild steel exists in its neighborhood are carried out. It is shown that mode II type fracture occurs when a crack is in the heat affected zone, the fracture mode changes to mode I type with the distance of crack position from the weld line and mode I type fracture occurs when a crack exists in each mother material. After that, finite element analyses corresponding to the experiments are carried out taking material properties in the weld line and heat affected zone into account, and the CED (crack energy density) in an arbitrary direction is evaluated through the results of finite element analyses. The applicability of fracture criterion based on the CED in an arbitrary direction is demonstrated to the crack growth initiation behavior of a crack parallel to a weld line between two different steels. Moreover, the effect of inhomogeneity by welding on the fracture resistance with the crack position is investigated based on the CED in an arbitrary direction.

Original languageEnglish
Pages (from-to)822-829
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume66
Issue number644
Publication statusPublished - 2000

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Steel
Welds
Cracks
Heat affected zone
Materials properties
Carbon steel
Fracture toughness
Crack propagation
Welding
Experiments

Keywords

  • Crack energy density
  • Fracture criterion
  • Fracture mechanics
  • Inhomogeneous material
  • Mixed-mode crack
  • Weld line
  • Welded joint

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

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title = "Growth behavior of a crack parallel to a weld line between two different steels (effect of crack position on fracture mode)",
abstract = "It was shown previously that a crack in a weld line between two different steels may cause mode II type fracture, even under so-called mode I type loading, due to the difference of material properties. In this study, the fracture experiments of the specimen in which a crack parallel to a weld line between high-tension steel and mild steel exists in its neighborhood are carried out. It is shown that mode II type fracture occurs when a crack is in the heat affected zone, the fracture mode changes to mode I type with the distance of crack position from the weld line and mode I type fracture occurs when a crack exists in each mother material. After that, finite element analyses corresponding to the experiments are carried out taking material properties in the weld line and heat affected zone into account, and the CED (crack energy density) in an arbitrary direction is evaluated through the results of finite element analyses. The applicability of fracture criterion based on the CED in an arbitrary direction is demonstrated to the crack growth initiation behavior of a crack parallel to a weld line between two different steels. Moreover, the effect of inhomogeneity by welding on the fracture resistance with the crack position is investigated based on the CED in an arbitrary direction.",
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T1 - Growth behavior of a crack parallel to a weld line between two different steels (effect of crack position on fracture mode)

AU - Utsunomiya, Takao

AU - Oku, Hayato

AU - Watanabe, Katsuhiko

AU - Ohira, Toshiaki

PY - 2000

Y1 - 2000

N2 - It was shown previously that a crack in a weld line between two different steels may cause mode II type fracture, even under so-called mode I type loading, due to the difference of material properties. In this study, the fracture experiments of the specimen in which a crack parallel to a weld line between high-tension steel and mild steel exists in its neighborhood are carried out. It is shown that mode II type fracture occurs when a crack is in the heat affected zone, the fracture mode changes to mode I type with the distance of crack position from the weld line and mode I type fracture occurs when a crack exists in each mother material. After that, finite element analyses corresponding to the experiments are carried out taking material properties in the weld line and heat affected zone into account, and the CED (crack energy density) in an arbitrary direction is evaluated through the results of finite element analyses. The applicability of fracture criterion based on the CED in an arbitrary direction is demonstrated to the crack growth initiation behavior of a crack parallel to a weld line between two different steels. Moreover, the effect of inhomogeneity by welding on the fracture resistance with the crack position is investigated based on the CED in an arbitrary direction.

AB - It was shown previously that a crack in a weld line between two different steels may cause mode II type fracture, even under so-called mode I type loading, due to the difference of material properties. In this study, the fracture experiments of the specimen in which a crack parallel to a weld line between high-tension steel and mild steel exists in its neighborhood are carried out. It is shown that mode II type fracture occurs when a crack is in the heat affected zone, the fracture mode changes to mode I type with the distance of crack position from the weld line and mode I type fracture occurs when a crack exists in each mother material. After that, finite element analyses corresponding to the experiments are carried out taking material properties in the weld line and heat affected zone into account, and the CED (crack energy density) in an arbitrary direction is evaluated through the results of finite element analyses. The applicability of fracture criterion based on the CED in an arbitrary direction is demonstrated to the crack growth initiation behavior of a crack parallel to a weld line between two different steels. Moreover, the effect of inhomogeneity by welding on the fracture resistance with the crack position is investigated based on the CED in an arbitrary direction.

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KW - Mixed-mode crack

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KW - Welded joint

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