Cargo Hold Corner Barrier Segmentation for Thermal Stress
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Solution Overview
Problem
Existing barrier structures for cargo hold corners in ships transporting cryogenic fluids, such as LNG, are vulnerable to thermal stress, peel stress, and shear stress due to deformation of the hull, leading to damage under various load conditions.
Innovation Solution
A barrier structure that includes a supporting member on top of the lower corner insulation board to support the second curved barrier, with a second joint barrier connecting the lower corner insulation boards and a second flat barrier, allowing for separation and installation in transverse and longitudinal directions to enhance stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lower corner insulation board is manufactured as an integrated type by bonding plywood protective plate to foam insulation member, then the manufacturing process is simplified, but the structure becomes vulnerable to thermal stress, peel stress, and shear stress caused by hull deformation
Solution Approach 1:
The lower corner insulation board is divided into separate components: a lower protective plate, a lower insulation member, and optionally a lower auxiliary panel. These components are not bonded together but remain separable, allowing each to move independently under thermal stress or hull deformation, thereby preventing the peel stress and shear stress that would occur in a bonded integrated structure.
2Device complexity
If the lower corner insulation board is manufactured as an integrated type, then the number of components is reduced, but the structure cannot endure loads generated during expansion and contraction under various load conditions
Solution Approach 1:
The insulation board is segmented into separate components that can expand and contract independently under various load conditions. The lower protective plate, lower insulation member, and lower auxiliary panel are positioned to overlap or abut each other without being bonded, allowing each component to respond to thermal expansion and mechanical loads independently, thereby maintaining structural integrity under varying conditions.
3Ease of operation
If the lower corner insulation board uses bonded construction, then the assembly is simpler to install, but the bonded joints become vulnerable to peel stress and shear stress from hull deformation
Solution Approach 1:
The construction eliminates bonded joints between the lower protective plate, lower insulation member, and lower auxiliary panel by using a non-bonded assembly where components overlap or abut each other. This segmentation removes the vulnerable bonded interfaces that would otherwise be subjected to peel stress and shear stress from hull deformation, while the components remain simple to install in sequence.
Data Source
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AI summary
Disclosed herein are a barrier structure for a cargo hold corner and a method of installing a barrier of a cargo hold corner. A barrier structure for a cargo hold corner includes at least one lower corner insulation board including a first corner insulation board and a second corner insulation board each manufactured to be separated as a single body and installed at a corner of a cargo hold, wherein: the first corner insulation board and the second corner insulation board have a shape in which a lower protective plate, a lower insulation member, and a lower auxiliary panel are stacked; and an incline of the second corner insulation board is attached to an incline of one side of the first corner insulation board to form an interface therebetween.