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Materials Technology

Cryogenic Fatigue Strength Assessment for MARK-III Insulation System of LNG Carriers

[+] Author and Article Information
Myung Hyun Kim

 Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan, 609-735, Republic of Koreakimm@pusan.ac.kr

Yoon Pyo Kil, Jae Myung Lee

 Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan, 609-735, Republic of Korea

Min Sung Chun1

 Samsung Heavy Industries, Co., Ltd., 530 Jangpyeong-dong, Geoje, Gyeongnam, 656–710, Republic of Korea

Yong Suk Suh

 Samsung Heavy Industries, Co., Ltd., 530 Jangpyeong-dong, Geoje, Gyeongnam, 656–710, Republic of Korea

Wha Soo Kim, Byung Jae Noh

 Hyundai Heavy Industries, Co., Ltd., 1 Jeonha-dong, Dong-gu, Ulsan, 682–792, Republic of Korea

Jang Ho Yoon

 American Bureau of Shipping, Busan, 600–737, Republic of Korea

Min Soo Kim

 Lloyd’s Register, 862-1 Beomchon 1-dong, Busanjin-gu, Busan, 614–724, Republic of Korea

Hang Sub Urm

 Det Norske Veritas Korea Ltd., 36-7 Namchon 1-dong, Suyong-gu, Busan, 613–011, Republic of Korea

1

Corresponding author.

J. Offshore Mech. Arct. Eng 133(4), 041401 (Apr 12, 2011) (10 pages) doi:10.1115/1.4003389 History: Received September 18, 2009; Revised October 10, 2010; Published April 12, 2011; Online April 12, 2011

The objective of this study is to investigate the typical failure mode and to obtain the stress range versus number of cycles to failure (S-N) data of MARK-III type liquefied natural gas (LNG) insulation system under the fatigue loading at actual cryogenic environment. A systematic experimental research is carried out for the assessment of the fatigue strength of MARK-III insulation system at cryogenic temperature. Three different types of test specimens are tested for the evaluation of fatigue performance of MARK-III insulation system. Test specimens are determined considering the fatigue vulnerable locations such as mastic area, slit area, and top bridge pad area inside the actual LNG cargo tanks. All test specimens are fabricated as close as possible to the actual yard practice. A series of fatigue test results is represented as S-N curves. Cyclic fatigue loadings were carefully considered similar to the actual sloshing loads. The effect of sloshing impacts is considered by selecting the stress ratio (R=10). The load levels have been determined based on the ultimate strength of reinforced polyurethane foam as 12.2 bars. Different cryogenic temperatures are employed according to the test locations in consideration of temperature gradient within the insulation system. All test results including fatigue life, as well as failure locations of MARK-III insulation system at cryogenic temperatures, are reported and compared with those at room temperature. Consistent S-N curves of MARK-III insulation system at both room and cryogenic temperatures are obtained and compared. The slopes of S-N curves from both fatigue test results are observed to be almost identical, and the fatigue strengths are found to exhibit similar trend. The results from this research can be used for the fatigue assessment of the LNGC insulation system, as well as a design guideline of LNG CCS at cryogenic temperature.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Mark-III containment system

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Figure 2

Dimension for the test specimen considering the location of mastic (type-I mastic width of 20 mm)

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Figure 3

Dimension for the test specimen considering the location of mastic (type-II mastic width of 40 mm).

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Figure 4

Dimension for the test specimen (type-II)

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Figure 5

Dimension for the test specimen considering the location of mastic (type-III)

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Figure 6

Completed test specimens

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Figure 7

Hydraulic structural fatigue test machine

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Figure 8

Cryogenic chamber and its dimension

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Figure 9

Stress ratio (e.g., ULS 100%)

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Figure 10

Cryogenic fatigue test set up of a test specimen

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Figure 11

Graph for contraction of the specimen during cooling down

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Figure 12

Typical failure mode of type-I specimen mastic width of 20 mm

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Figure 13

S-N curve for type-I specimen mastic width of 20 mm

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Figure 14

Typical failure mode of type-I specimen mastic width of 40 mm

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Figure 15

S-N curves for type-I specimen mastic width of 40 mm

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Figure 16

Typical failure mode of type-II specimen

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Figure 17

S-N curves for type-II specimen

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Figure 18

Typical failure mode of type-III specimen

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Figure 19

S-N curve for type-III specimen

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Figure 20

Combined S-N Curves at room tests and cryogenic tests

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