Analysis of Shear Behavior and Fracture Characteristics of Plywood in Cryogenic Environment

Abstract

Plywood is a laminated wood material where alternating layers are perpendicular to each other. It is used in a liquefied natural gas (LNG) carrier for an insulation system because it has excellent durability, a light weight, and high stiffness. An LNG cargo containment system (LNG CCS) is subjected to loads from gravity, sloshing impact, hydrostatic pressure, and thermal expansion. Shear forces are applied to an LNG CCS locally by these loads. For these reasons, the materials in an LNG CCS must have good mechanical performance. This study evaluated the shear behavior of plywood. This evaluation was conducted from room temperature (25 °C) to cryogenic temperature (-163 °C), which is the actual operating environment of an LNG storage tank. Based on the plywood used in an LNG storage tank, a shear test was conducted on specimens with thicknesses of 9 mm and 12 mm. Analyses were performed on how the temperature and thickness of the plywood affected the shear strength. Regardless of the thickness, the strength increased as the temperature decreased. The 9 mm thick plywood had greater strength than the 12 mm thick specimen, and this tendency became clearer as the temperature decreased.

Seismic resistance analysis of a plywood house structure based on ABAQUS fracture mechanics

“…The Korean Society of Ocean Engineers evaluated the shear behavior of plywood with two different thicknesses from room temperature to cryogenic temperature. The result suggested that plywood temperature decreases, yield strain decreases, and shear strength and elastic modulus increase [4]. Using ABAQUS, this study aims to comprehensively model timber structures subjected to seismic loads, allowing a detailed examination of deflection, and maximum stress distributions.…”

Fracture Estimation in Ship Collision Analysis—Strain Rate and Thermal Softening Effects

“…Future work in this area may involve exploiting the temperature effect term for extreme ambient temperatures, such as the low-temperature conditions in the Arctic Sea [39], cryogenic conditions in an LNG tank [40,41], and elevated temperatures associated with fire [42,43].…”