A centre-notched small size tension test specimen was developed to evaluate the toughness against unstable brittle fracture from fatigue crack, which is initiated and propagated from the surface of the butt-welded joints of heavy-thick steel plates. Centre-notched small size tension test specimens were made from butt-welded joints of 70 mm heavy-thick steel plates and employed for the tests using this plate thickness as the specimen width. In this paper, the test results are evaluated and investigated. Fracture toughness value (Kid) against unstable brittle fracture from fatigue crack, which is initiated and propagated from the welded toe of butt-welded joint of 70 mm heavy-thick steel plates, was grasped by centrenotched small size tension test specimens using the plate thickness as the specimen width. When the tested electrogas-welded joint is applied to a large welded structure such as a mega-container ship, the allowable surface fatigue crack length along the welded bead is determined to be about 100 mm, when a nominal yield stress (460 N/mm2) is applied to the structure at -10 deg C (the lowest design temperature for ships in normal worldwide service). On the other hand, the allowable surface fatigue crack length in tested steel plate, investigated in another paper is determined to be 340 mm.
Study on fracture toughness of welded joints for heavy-thick steel plates by centre-notched small size specimen
Studie über Bruchzähigkeit von Schweißverbindungen für sehr dicke Stahlplatten mit zentral gekerbten kleinen Proben
Welding in the World ; 55 , 5/6 ; 84-92
2011
9 Seiten, 19 Bilder, 3 Tabellen, 3 Quellen
Aufsatz (Zeitschrift)
Englisch
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