LNG 선박용 알루미늄 합금 소재의 정적 및 피로 강도 평가

Natural Gas is stored in the tank as a Liquefied Natural Gas, which is liquefied at the condition of atmosphere pressure and cryogenic temperature. LNG ship is increased because of the high oil price. Also, it is exposed very long time under the cryogenic temperature and high pressure, and it is very important to secure the structural safety in this envelopment. Until now, the material properties which composing the storage tank of LNG ship has experimented at room temperature, so the properties which experiments at the cryogenic temperature are not enough to apply for the design. 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. S-N curves were designed at both temperature respectively. Also, P-S-N curve was performed statistical method by JSME-S002.