Fracture assessment of cold-press-formed square hollow sections at welded joints

Advances in Civil Engineering and Building Materials ◽

10.1201/b13165-159 ◽

2012 ◽

pp. 773-777

Author(s):

M Arita ◽

Y Kayamori ◽

Y Suzuki ◽

K Hanya ◽

T Suzuki ◽

...

Keyword(s):

Welded Joints ◽

Cold Press ◽

Fracture Assessment

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Fracture Assessment of Cracked Welded Structures Considering the Heterogeneity of Welded Joints

Procedia Materials Science ◽

10.1016/j.mspro.2014.06.092 ◽

2014 ◽

Vol 3 ◽

pp. 556-561 ◽

Cited By ~ 2

Author(s):

Egor Moskvichev

Keyword(s):

Welded Joints ◽

Welded Structures ◽

Fracture Assessment

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Fracture Assessment of Weld Joints of High-Strength Steel in Pre-Strained Condition

Applied Sciences ◽

10.3390/app9071306 ◽

2019 ◽

Vol 9 (7) ◽

pp. 1306

Author(s):

Gyubaek An ◽

Jeongung Park ◽

Mituru Ohata ◽

Fumiyoshi Minami

Keyword(s):

Fracture Toughness ◽

Welded Joints ◽

Steel Structures ◽

Great Earthquake ◽

Small Scale ◽

Ship Structures ◽

Strained Condition ◽

Critical Fracture ◽

Fracture Assessment ◽

Unstable Fractures

Unstable fractures tend to occur after ductile crack initiation or propagation. In most collapsed steel structures, a maximum 15% pre-strain was recorded, at the steel structural connections, during the great earthquake of 1995, in Japan. Almost-unstable fractures were observed in the beam-to-column connections, where geometrical discontinuities existed. Structural collapse and unstable failure occurred after large-scale plastic deformations. Ship structures can also suffer from unstable fractures in the welded joints. The fracture resistance of butt-welded joints subjected to tension in the pre-strained condition was estimated by considering the toughness deterioration, due to pre-strain and toughness correction for constraint loss in a tension specimen. The target specimen for this fracture assessment was a double-edged, through-thickness crack panel, with a crack in the weld joint (heat-affected zone (HAZ)). The critical fracture toughness value (crack tip opening displacement (CTOD)) of a large structure with pre-strain, which was applied to the HAZ region, was estimated from a small-scale, pre-stained, three-point bend specimen. Fracture toughness values, evaluated by a CTOD test, were recently mandated for shipbuilding steel plates. The critical fracture toughness value is a very useful parameter to evaluate the safety of huge ship structures.

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