Effects of Environmental Conditions on the Mechanical and Degradation Behavior of Polyurethane Foam Subjected to Various
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JMEPEG https://doi.org/10.1007/s11665-019-04259-w
Effects of Environmental Conditions on the Mechanical and Degradation Behavior of Polyurethane Foam Subjected to Various Deformation Histories Tae-Wook Kim, Seul-Kee Kim, Jeong-Hyeon Kim, and Jae-Myung Lee (Submitted August 30, 2018; in revised form July 1, 2019) Since its development, polyurethane foam (PUF) has been widely used as an insulator, including in the marine industry. Liquefied natural gas (LNG) carriers have the highest market share in the LNG-related shipbuilding industry. PUF is used as an insulator in membrane-type cargo containment systems (CCSs) as one of the most important components of LNG carriers. Because PUF is subjected to constant load and deformation when used in insulation for LNG CCSs and is exposed to the cryogenics of the seawater environment for extended times, it is essential to evaluate the mechanical behavior of PUF in such environments. In this study, to investigate the effects of applying an initial strain and of immersion in various media on the mechanical properties of PUF, compression tests were carried out at ambient and cryogenic temperature using a universal testing machine. The mechanical behavior of PUF after deformation recovery upon subjection to various initial strain levels was estimated experimentally. In addition, the microstructure of the PUF specimen prior to testing was analyzed to investigate the effects of the initial strain level and immersion in different media on the mechanical behavior of PUF. Keywords
deformation recovery, immersion conditions, liquefied natural gas, mechanical behavior, polyurethane foam
1. Introduction In recent years, the consumption of liquefied natural gas (LNG) has increased faster than that of other less eco-friendly energy resources due to the depletion of fossil fuels, the increasing stringency of environmental regulations, and the decline in LNG prices owing to the development of shale gas (Ref 1, 2). Due to the growing global demand for LNG, the demand for high value-added vessels and offshore plants [such as LNG carriers, LNG floating production storage offloading (FPSO), and LNG floating storage re-gasification units (FSRU)], which are used in the collection and transportation of liquefied natural gas, has also steadily increased. LNG carriers have the highest market share in the LNG-related shipbuilding and marine industries. One of the most important components of these carriers is the cargo containment system (CCS). Membrane-type CCSs have been widely built owing to their high capacity and economic efficiency. The Mark-III insulation system, which is a membrane-type system, consists of a primary barrier made of SUS 304L and a plywood insulation component composed of
Tae-Wook Kim, Offshore Industries R&BD Center, Korea Research Institute of Ships and Ocean Engineering (KRISO), Jangmok-myeon, Geoje-si, Gyeongsangnam-do, Korea; Seul-Kee Kim, JeongHyeon Kim, and Jae-Myung Lee, Department of Naval Architecture and Ocean Engineering, Pusan National University, Jangjeon-dong, Geumjeong-
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