[논문]Fatigue Analysis of LNG Cargo Containment System Connections in Membrane LNG Carrier

Park, Jun-Bum

doi:10.5574/jaroe.2017.3.3.112

Fatigue Analysis of LNG Cargo Containment System Connections in Membrane LNG Carrier 원문보기

As an LNG carrier preserves and transports liquefied natural gas under minus $163^{\circ}C$, the cargo tank has to have sufficient hull strength against not only the wave loads but also against loads caused by loading and unloading and thermal expansion to keep the LNG safely. The main insulation types for a CCS are No.96 and Mark III from GTT for the membrane LNG carrier. Particularly, the invar membrane plate in No.96 is very thin and its connections could experience high local stresses owing to such dynamic loads. Therefore, it should be verified whether those connections have sufficient fatigue lives for the purpose of operation and maintenance. This research aims at performing fatigue analysis with 0.1 fatigue damage criteria for 40 years of design life to support new membrane CCS development using proper S-N curves and the associated finite element modeling technique for each connection and then propose a reasonable design methodology.

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문제 정의

This study proposed a useful methodology for predicting the fatigue life of an invar membrane-type CCS, and presented the results from the analysis performed using the proposed methodology. The significance of the study lies in the fact that it is a pioneering study on the future development of an invar membrane-type CCS.
This study aimed to develop an invar membrane-type CCS. To that end, the study proposed a finite element modeling methodology for invar membrane connections and conducted simplified fatigue analysis for assessing the fatigue life of the connections.
This study considered an assessment of the fatigue strength of a CCS for LNG carriers, which is subject to wave loads, loads during loading and unloading, and thermal expansion loads. Owing to the configuration of carrier tanks, the upper deck becomes the location where large longitudinal bending stresses are applied.

제안 방법

As all stresses corresponding to the load conditions to be applied in the fatigue analysis were longitudinal loads, the study implemented a unit load, such that the nominal stress for the structural analysis model becomes 1 MPa. The calculation of the maximum stress concentration factor ensued for locations of fatigue damage analysis.
68. Furthermore, simplified fatigue analysis was conducted for calculating fatigue damage. The Weibull shape parameter used in the calculation was referenced from the DNV Classification Notes No.
To that end, the study proposed a finite element modeling methodology for invar membrane connections and conducted simplified fatigue analysis for assessing the fatigue life of the connections. Furthermore, where the fatigue life is not satisfied, the study suggested a design alternative with reasonable configuration.
This research has performed the fatigue analysis based on 40-year design life and no greater than 0.1 of fatigue damage under load conditions such as dynamic wave loads (North Atlantic Ocean), still water bending moments variation due to LNG loading and unloading and thermal expansion and contraction loads from annual inspection according to IGC(international gas carrier) code (IMO, 2014).
This study proposed a useful methodology for predicting the fatigue life of an invar membrane-type CCS, and presented the results from the analysis performed using the proposed methodology. The significance of the study lies in the fact that it is a pioneering study on the future development of an invar membrane-type CCS.
This study aimed to develop an invar membrane-type CCS. To that end, the study proposed a finite element modeling methodology for invar membrane connections and conducted simplified fatigue analysis for assessing the fatigue life of the connections. Furthermore, where the fatigue life is not satisfied, the study suggested a design alternative with reasonable configuration.

이론/모형

For modeling to incorporate lap joint welding, the only available method was the one given in DNVGL-CG0152. Accordingly, this method was employed for creating the model (Det Norske Veritas and Germanischer Lloyd, 2016).

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Fatigue Analysis of LNG Cargo Containment System Connections in Membrane LNG Carrier 원문보기

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