Critical Condition of Ductile Crack Extension and Its Critical Condition of Subsequent Brittle Fracture for High Strength Steel

Kawabata, Tomoya; Ohata, Mitsuru; Minami, Fumiyoshi

doi:10.2534/jjasnaoe.5.235

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…In order to figure out the degradation mechanisms for the absorbed energy per unit thickness of sub-size Charpy specimen showing fully ductile fracture manner, here, by using simplified FE-calculation, the ductile crack initiation and propagation under dynamic loading can be described as simple strain criterion [7]. However, critical criterion against ductile crack propagation under high strain rate, the critical strain value was decided properly so that total absorbed energy matched the real value.…”

Section: Fem Analysis For Charpy Impact Test For Ductile Materials 3-...mentioning

confidence: 99%

Os14f025 Consideration on the Toughness Requirement to the Austenitic Weld Metal in the LNG Storage Tanks Subjected to a Partial Height Hydro Test

Kawabata¹,

Arimochi²,

Ando³

et al. 2011

ATEM

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PD7777 published by British Standard Institute in 2000 proposes an additional fracture requirement to the main steel components of the low temperatures storage tank where a partial hydro static test is allowed instead of the full height hydro static test. In the PD7777 a high level (75J) of fracture toughness is required for the austenitic weld metal in 9%Ni steel plate to prevent the re-initiation of ductile fracture from the arrested brittle crack in the weld. However, it is seemed that this high level requirement is derived from the J-Cv correlation of carbon steel base plate and the ductile crack initiation behaviour of austenitic weld metal is conservatively assessed. This is to report a study that the J-Cv correlation of austenitic weld metal is determined by the experimental data obtained from the actual weld joints in 9%Ni steel plate in order to assess a rational toughness requirement to the austenitic weld metal employed in the 9% Ni made LNG storage tanks. From this study it is concluded that fracture toughness of 75J is too conservative and 50J is adequate. In addition an FEM analysis was performed to verify the validity of the weld including large amount of heterogeneity in yield strength distribution.There is a difficult problem that the requirements for thin plate by sub-size Charpy are much more conservative than full size Charpy requirement due to a characteristic that the absorbed energy of sub-size specimen remarkably decreases not in proportion to the specimen thickness. This report also includes the suggestion about adequate requirement value for sub-size Charpy in austenitic weld metal through the experimental evaluation of J-Cv relationship.

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Section: Fem Analysis For Charpy Impact Test For Ductile Materials 3-...mentioning

confidence: 99%

Os14f025 Consideration on the Toughness Requirement to the Austenitic Weld Metal in the LNG Storage Tanks Subjected to a Partial Height Hydro Test

Kawabata¹,

Arimochi²,

Ando³

et al. 2011

ATEM

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Effect of Undermatched Joint on Brittle Fracture Behavior of High Strength Steel Plate

Kawabata¹,

Sakaibori²,

Onishi³

et al. 2010

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Issues in Using Reduced-Size Specimen for Brittle Fracture Evaluation of Beam-to-Column Steel Connections

Oie

Kawabata

Kishiki

et al. 2022

Nihon Kenchiku Gakkai Kozokei Ronbunshu

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Critical Condition of Ductile Crack Extension and Its Critical Condition of Subsequent Brittle Fracture for High Strength Steel

Cited by 4 publications

References 9 publications

Os14f025 Consideration on the Toughness Requirement to the Austenitic Weld Metal in the LNG Storage Tanks Subjected to a Partial Height Hydro Test

Os14f025 Consideration on the Toughness Requirement to the Austenitic Weld Metal in the LNG Storage Tanks Subjected to a Partial Height Hydro Test

Effect of Undermatched Joint on Brittle Fracture Behavior of High Strength Steel Plate

Issues in Using Reduced-Size Specimen for Brittle Fracture Evaluation of Beam-to-Column Steel Connections

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