Abstract
In this study, the mechanical performance of melamine–urea–formaldehyde (MUF) resin plywood composed of an orthotropic material, which is used as a structural material in liquefied natural gas (LNG) cargo containment systems (CCSs), is evaluated. With a decrease in temperature, the plywood changes from ductile to brittle under compressive loads; thus, it may fail to distribute the compressive loads caused by sloshing impact as well as lose its stiffness, which helps maintain the shape of the structure. However, only a few studies investigated the mechanical characteristics of MUF resin plywood under compressive loads caused by sloshing impact as well as the crack propagation and change in material features with decreasing temperatures. Therefore, the present study investigated the mechanical performance of MUF plywoods of different thicknesses under different temperatures and grain orientation parameters. The results indicate the mechanical properties of MUF plywood for compression with decreasing temperatures. Furthermore, based on thermomechanical analysis, this study shows that the critical temperature at which the plywood material tends to transition from ductile to brittle behavior is − 110 °C. This finding will help in the design of MUF plywood-based LNG CCSs considering its low-temperature brittleness.
Highlights
In the past few years, the liquefied natural gas (LNG) trade has gradually increased
In this study, compression tests were conducted on MUF resin plywood used in LNG cargo containment systems (CCSs) with different plywood thicknesses, fiber orientations, and test temperatures
The Critical temperature (CT) is important because when a structural material is exposed to a cryogenic liquid, the material becomes brittle, which can be dangerous from the viewpoint of structural safety
Summary
In the past few years, the liquefied natural gas (LNG) trade has gradually increased. The compressive behavior of MUF resin plywood (with 9 mm and 12 mm thicknesses) used in NO96 and Mark-III was investigated considering the actual compressive environment of LNG CCSs involving sloshing impact at a wide range of temperatures (from ambient to cryogenic temperatures) [18, 19].
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