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Abstract : Liquefied Natural Gas is liquefied at the condition of atmosphere pressure and cryogenic temperature. LNG is exposed very long time under the cryogenic temperature and high pressure, and it is very important to retain the structural safety in this envelopment. Until now, the material which are composing the storage tank of LNG ship has experimented at room temperature, so it is not enough to apply for the design at the cryogenic temperature. The purposes of this study are investigated mechanical properties for aluminum alloy. To evaluate tensile and fatigue test for aluminum alloy, it was considering static and fatigue conditions at room and cryogenic temperature. S-N curves were designed at both temperature respectively. Also, P-S-N curve was performed statistical method by JSME-S002. Key Words : aluminum alloy, tensile test, fatigue test, cryogenic temperature, LNG ship † Corresponding Author: Jae Hoon Kim, Tel : +82-42-821-6645, E-mail : kimjhoon@cnu.ac.krDepartment of Mechanical Design Engineering, Chungnam National University. 99, Daehak-ro, Yuseong-gu, Daejon 305-764, Korea

Assessment for Static and Fatigue Strength of the Aluminum Alloy for LNG Ship