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http://dx.doi.org/10.5916/jkosme.2017.41.4.337

A numerical study on the fatigue evaluation of mark-III LNG primary barrier  

Kwon, Sun-Beom (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Kim, Myung-Sung (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Lee, Jae-Myung (Department of Naval Architecture and Ocean Engineering, Pusan National University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.41, no.4, 2017 , pp. 337-344 More about this Journal
Abstract
The demand of liquified natural gas is increasing due to environmental issues. This reason has resulted in increasing the capacity of liquified natural gas cargo tank. The Mark-III type primary barrier directly contacts liquified natural gas. Also, the primary barrier is under various loading conditions such as weight of liquified natural gas and sloshing loads. During a ship operation, various loads can cause fatigue failure. Therefore, the fatigue life prediction should be evaluated to prevent leakage of liquified natural gas. In the present study, the fatigue analysis of insulation system including primary barrier is performed using a finite element model. The fatigue life of primary barrier is carried out using a numerical study. The value of principle stress and the location of maximum principle stress range are calculated, and the fatigue life is evaluated. In addition, the effects on the insulation panel status and the arrangement of knot or corrugation are analyzed by comparing the fatigue life of various models. The insulation system which has best structural performance of primary barrier was selected to ensure structural integrity in fatigue assessment. These results can be used as a design guideline and a fundamental study for the fatigue assessment of primary barrier.
Keywords
Liquefied natural gas carrier; Sloshing; Primary barrier; Numerical Study; Fatigue life;
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