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Research Papers: Materials and Fabrication

A Comparative Evaluation of Fatigue and Fracture Characteristics of Structural Components of Liquefied Natural Gas Carrier Insulation System

[+] Author and Article Information
Hyeon Su Kim

Graduate Student
Department of Naval Architecture
and Ocean Engineering,
Pusan National University,
Busan 709-635, Korea
e-mail: ssu3846@pusan.ac.kr

Min Sung Chun

Senior Engineer
Marine Research Institute,
Samsung Heavy Industries, Co., Ltd.,
Geoje 656-710, Korea
e-mail: minsung.chun@samsung.com

Jae Myung Lee

Professor
Mem. ASME
e-mail: jaemlee@pusan.ac.kr

Myung Hyun Kim

Professor
Mem. ASME
e-mail: kimm@pusan.ac.kr
Department of Naval Architecture
and Ocean Engineering,
Pusan National University,
Busan 709-635, Korea

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 26, 2012; final manuscript received July 18, 2012; published online March 18, 2013. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 135(2), 021405 (Mar 18, 2013) (9 pages) Paper No: PVT-12-1009; doi: 10.1115/1.4007473 History: Received January 26, 2012; Revised July 18, 2012

This study examined the fatigue strength and fracture toughness of the structural components of membrane type liquefied natural gas carrier (LNGC) insulation systems, such as reinforced poly-urethane foam (R-PUF, insulation material) and 304 L stainless steel (STS 304 L, Primary barrier membrane), at both ambient and cryogenic temperatures. The fatigue strength of the LNGC insulation system was compared with that of low density R-PUF (130 kg/m3) and high density R-PUF (210 kg/m3). The fracture toughness of R-PUF and STS 304 L was investigated in terms of the density effect of R-PUF and the difference in the nickel composition of STS 304 L, STS 304 L (10.2%Ni) versus STS 304 L (9.4%Ni) at both ambient and cryogenic temperatures. In this study, the high density R-PUF (210 kg/m3) and STS 304 L (9.4%Ni) were proposed to improve the structural strength of the LNGC insulation system and reduce the cost. The fracture toughness was characterized in terms of the critical strain energy release rate (GIC) in the context of linear elastic fracture mechanics (LEFM). The geometries of the fracture toughness test used were the center-cracked tension (CCT) and double-edge-cracked tension (DECT) specimens according to ASTM STP381 standard.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

Schematic diagram of the GTT Mark-III type LNG cargo containment system

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Fig. 2

Schematic diagram of the fatigue test specimen

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Fig. 3

Types of test specimens

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Fig. 4

Configuration of the specimen

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Fig. 5

Fabrication of the test specimen

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Fig. 6

Fatigue test machine (IST-8800, INSTRON)

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Fig. 7

Typical failure mode of the test specimen

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Fig. 8

Fatigue loading step

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Fig. 9

Typical fatigue failure mode of low density foam

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Fig. 10

Typical failure modes of high density foam

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Fig. 11

Displacement range versus fatigue life (log–log scale)

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Fig. 12

S–N curve based on the nominal stress approach (log–log scale)

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Fig. 13

Types of the test specimen

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Fig. 14

Fabrication of the notches (ASTM STP 381)

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Fig. 15

Fabricated specimens with aluminum jigs

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Fig. 16

Typical failure modes of the fracture test (R-PUF)

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Fig. 17

Typical failure modes of the fracture test (STS 304 L)

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Fig. 18

Applied stress versus allowable crack length curves of R-PUF

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Fig. 19

Applied stress versus the allowable crack length curves of STS 304 L

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