Visualization and classification of hidden defects in triplex composites used in LNG carriers by active thermography

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Triplex composite is an epoxy-bonded joint structure, which constitutes the secondary barrier in a liquefied natural gas (LNG) carrier. Defects in the triplex composite weaken its shear strength and may cause leakage of the LNG, thus compromising the structural integrity of the LNG carrier. This paper proposes an autonomous triplex composite inspection (ATCI) system for visualizing and classifying hidden defects in the triplex composite installed inside an LNG carrier. First, heat energy is generated on the surface of the triplex composite using halogen lamps, and the corresponding heat response is measured by an infrared (IR) camera. Next, the region of interest (ROL is traced and noise components are removed to minimize false indications of defects. After a defect is identified, it is classified as internal void or uncured adhesive and its size and shape are quantified and visualized, respectively. The proposed ATCI system allows the fully automated and contactless detection, classification, and quantification of hidden defects inside the triplex composite. The effectiveness of the proposed ATCI system is validated using the data obtained from actual triplex composite installed in an LNG carrier membrane system.
Publisher
TECHNO-PRESS
Issue Date
2019-12
Language
English
Article Type
Article
Citation

SMART STRUCTURES AND SYSTEMS, v.24, no.6, pp.803 - 812

ISSN
1738-1584
DOI
10.12989/sss.2019.24.6.803
URI
http://hdl.handle.net/10203/268773
Appears in Collection
CE-Journal Papers(저널논문)
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