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.

中文翻译：

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温度对膜式LNG载体保温系统中胶合板机械性能的影响

在这项研究中，评估了由正交各向异性材料组成的三聚氰胺-脲-甲醛（MUF）树脂胶合板的机械性能，该胶合板用作液化天然气（LNG）货物围护系统（CCS）的结构材料。随着温度的降低，胶合板在压缩载荷下会从韧性转变为脆性。因此，它可能无法分散由晃荡冲击引起的压缩载荷，并且失去其刚度，从而有助于保持结构的形状。然而，只有很少的研究研究了MUF树脂胶合板在晃荡冲击引起的压缩载荷下的力学特性，以及随着温度降低裂纹扩展和材料特征的变化。因此，本研究研究了在不同温度和晶粒取向参数下不同厚度的MUF胶合板的力学性能。结果表明，MUF胶合板的力学性能随温度降低而压缩。此外，基于热力学分析，这项研究表明，胶合板材料趋于从延性转变为脆性的临界温度为-110°C。考虑到其低温脆性，这一发现将有助于基于MUF胶合板的LNG CCS的设计。这项研究表明，胶合板材料趋于从韧性​​转变为脆性的临界温度为− 110°C。考虑到其低温脆性，这一发现将有助于基于MUF胶合板的LNG CCS的设计。这项研究表明，胶合板材料趋于从韧性​​转变为脆性的临界温度为− 110°C。考虑到其低温脆性，这一发现将有助于基于MUF胶合板的LNG CCS的设计。