Dependence between η -factor and crack location relative to a fusion boundary between hard and soft materials in a SE(B) specimen

Sebastian Lindqvist (Corresponding Author), Juha Kuutti

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2 Citations (Scopus)

Abstract

The current solutions in ASTM E1820 and E1921 for the calculation of the J-integral are not necessary directly applicable for strength mismatched welds. The problem is connected to the η-factor relating the experimentally measured work to the J-integral. Previous, investigations on η-factors for welds have focused mainly on cracks at the center of the weld. However, characterisation of the η-factor at other locations is also important since the crack can form anywhere in the weld. In this study, the η-factors for SE(B) specimens were investigated, with focus on the effect of the crack location relative to the fusion boundary between a hard base metal and a soft weld metal of a dissimilar metal weld. The results show a dependence between the ηCMOD-factor, the distance of the crack to the fusion boundary, the size of the remaining ligament, and the size of the plastic deformation zone. This dependence cannot be generalised based on this study alone, but the results give insight for developing an analytical ηCMOD-equation for strength mismatched specimens.

Original languageEnglish
Pages (from-to)281-293
Number of pages13
JournalInternational Journal of Fracture
Volume211
Issue number1-2
DOIs
Publication statusPublished - 1 May 2018
MoE publication typeA1 Journal article-refereed

Fingerprint

Fusion
Crack
Welds
Fusion reactions
Cracks
J-integral
Metals
Dissimilar metals
Plastic Deformation
Ligaments
Plastic deformation
Necessary

Keywords

  • DMWs
  • Multi-metal
  • SE(B)
  • Welds
  • η-Factor

Cite this

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title = "Dependence between η -factor and crack location relative to a fusion boundary between hard and soft materials in a SE(B) specimen",
abstract = "The current solutions in ASTM E1820 and E1921 for the calculation of the J-integral are not necessary directly applicable for strength mismatched welds. The problem is connected to the η-factor relating the experimentally measured work to the J-integral. Previous, investigations on η-factors for welds have focused mainly on cracks at the center of the weld. However, characterisation of the η-factor at other locations is also important since the crack can form anywhere in the weld. In this study, the η-factors for SE(B) specimens were investigated, with focus on the effect of the crack location relative to the fusion boundary between a hard base metal and a soft weld metal of a dissimilar metal weld. The results show a dependence between the ηCMOD-factor, the distance of the crack to the fusion boundary, the size of the remaining ligament, and the size of the plastic deformation zone. This dependence cannot be generalised based on this study alone, but the results give insight for developing an analytical ηCMOD-equation for strength mismatched specimens.",
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T1 - Dependence between η -factor and crack location relative to a fusion boundary between hard and soft materials in a SE(B) specimen

AU - Lindqvist, Sebastian

AU - Kuutti, Juha

PY - 2018/5/1

Y1 - 2018/5/1

N2 - The current solutions in ASTM E1820 and E1921 for the calculation of the J-integral are not necessary directly applicable for strength mismatched welds. The problem is connected to the η-factor relating the experimentally measured work to the J-integral. Previous, investigations on η-factors for welds have focused mainly on cracks at the center of the weld. However, characterisation of the η-factor at other locations is also important since the crack can form anywhere in the weld. In this study, the η-factors for SE(B) specimens were investigated, with focus on the effect of the crack location relative to the fusion boundary between a hard base metal and a soft weld metal of a dissimilar metal weld. The results show a dependence between the ηCMOD-factor, the distance of the crack to the fusion boundary, the size of the remaining ligament, and the size of the plastic deformation zone. This dependence cannot be generalised based on this study alone, but the results give insight for developing an analytical ηCMOD-equation for strength mismatched specimens.

AB - The current solutions in ASTM E1820 and E1921 for the calculation of the J-integral are not necessary directly applicable for strength mismatched welds. The problem is connected to the η-factor relating the experimentally measured work to the J-integral. Previous, investigations on η-factors for welds have focused mainly on cracks at the center of the weld. However, characterisation of the η-factor at other locations is also important since the crack can form anywhere in the weld. In this study, the η-factors for SE(B) specimens were investigated, with focus on the effect of the crack location relative to the fusion boundary between a hard base metal and a soft weld metal of a dissimilar metal weld. The results show a dependence between the ηCMOD-factor, the distance of the crack to the fusion boundary, the size of the remaining ligament, and the size of the plastic deformation zone. This dependence cannot be generalised based on this study alone, but the results give insight for developing an analytical ηCMOD-equation for strength mismatched specimens.

KW - DMWs

KW - Multi-metal

KW - SE(B)

KW - Welds

KW - η-Factor

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