In order to evaluate the fracture toughness of steel plates, centre-notched wide plate tension test is usually conducted using 400 mm width specimens. However, a large testing machine and huge expenditures are necessary in the case of 50-90 mm heavy-thick steel plates. In this paper, centre-notched small size tension test is proposed to evaluate the fracture toughness of heavy-thick steel plates by a simplified method. That is, centre-notched small size tension test specimens using the steel plate thickness (70 mm) as the specimen width were made and employed for the tests, and the test results were evaluated and investigated. Fracture toughness value (Kic) of 70 mm heavy-thick steel plates was evaluated using centre-notched small size tension test specimens, using the plate thickness as the specimen width. When the tested steel plate is applied to a large welded structure such as a mega-container ship, the allowable surface fatigue crack length is determined to be 340 mm, when nominal yield stress (460 N/mm2) is applied to the structure at -10 deg C (lowest design temperature for ships in normal worldwide service). On the other hand, the allowable surface fatigue crack length in tested electrogaswelded joint of the tested plate, investigated in another paper, is determined to be about 100 mm.
Study on fracture toughness evaluation by centre-notched small size specimen for heavy-thick steel plates
Studie über Bruchzähigkeitsentwicklung mit einer zentral gekerbten, kleiner Probe für sehr dicke Stahlplatten
Welding in the World ; 55 , 5/6 ; 78-83
2011
6 Seiten, 16 Bilder, 1 Tabelle, 3 Quellen
Aufsatz (Zeitschrift)
Englisch
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