LNG탱크용 알루미늄합금 A5083-O의 관통균열 전파거동 예측 모델

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 12; no. 1; pp. 50 - 57
• Main Authors: 김영식(Young-Sik Kim), 조상명(Sang-Myung Cho), 김종호(Jong-Ho Kim)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 1998
• Subjects: Fatigue fracture(피로파괴); LNG(액화천연가스); Fracture toughness(파괴인성); 2차 방벽 (Secondary barrier); Through crack(관통균열); LBB(파단 전 누설); 2
• ISSN: 1225-0767; 2287-6715

The leak before break(LBB) concept is generalized on the design of LNG tanks, pressure vessels and nuclear reactor in that any leakage of containment, in whatever amount, will not result in catastropic failure. For this purpose it is necessary to determine the surface crack shape, the opening displacement and the risk of catastropic brittle fracture when it becomes a through crack. In this study the crack propagation behavior of surface flaws and the crack opening displacement of through cracks under combined membrane and bending stresses were investigated with fatigue tests and fracture toughness test of aluminium alloy A5083-O. And fracture mechanics analysis of the crack opening displacement of through cracks were made in order to develop a new model expressing the behaviors of COD under combined membrane and bending stresses.