Vol.7, No1, 2007,
pp. 21-28 |
LOADING CONDITION EFFECT ON THE FRACTURE OF WELDED THIN-WALLED STORAGE TANK Nada Filipović 1 Katarina Gerić 2 Stojan Sedmak 3 1 Zavod za zavarivanje, Belgrade 2 Faculty of Technical Sciences, University of Novi Sad, Serbia 3 Faculty of Tehnology and Metallurgy, University of Belgrade, Serbia |
Abstract Loading conditions can affect significantly the fracture mode of storage tanks in service. Two different fracture mechanisms experienced in service of thin-walled pressure vessels of the same wall thickness (8 mm) are presented. Brittle fracture of the storage tank made of structural steel S355J2G3 (EN 10025) and transition temperature –20°C occurred during the first proof pressure test with nitrogen. Due to overloading and temperature increase, a mobile storage tank for ammonia transportation, made of microalloyed steel TSt 460 (DIN EN 10113-2), failed by a ductile mechanism. In both cases, although they exhibited different fracture mechanisms, the crack was initiated in the heat-affected-zone of the welded joint. Keywords: brittle fracture, ductile fracture, pressure vessel, welded joint, heat-affected-zone, loading condition |
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