An Innovative "No Hot Work" Approach to Hull Repair on In-Service FPSOs Using Sandwich Plate System Overlay

Kennedy, Stephen J.; Bond, James; Braun, D C; Noble, Peter G.; Forsyth, J. David

doi:10.4043/15315-ms

Cited by 12 publications

(6 citation statements)

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“…All sandwich models meet the BV criteria [28], including Model D, which has von mises stress very close to the allowable stress, 162.4 MPa. In other studies, the sandwich model's maximum stress was smaller than the strength requirement [11,19,26] and the conventional model [11,19].…”

Section: Comparison Of Deformationmentioning

confidence: 83%

“…70% of the steel yield strength is a safety factor that is also considered as essential parameters in static analysis for engineering structure. The safety factor of sandwich panels with poly-urethane elastomer cores for ship and bridge structure is also developed from the yield strength of steel [26,29]. All sandwich models meet the BV criteria [28], including Model D, which has von mises stress very close to the allowable stress, 162.4 MPa.…”

Section: Comparison Of Deformationmentioning

confidence: 99%

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Study of sandwich panel application on side hull of crude oil tanker

et al. 2021

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A lightweight sandwich plate system (SPS) consisted of steel faceplate and polyurethane elastomer composite cores have excellent potential to be applied on the ship structure. Steel faceplate and polyurethane elastomer (PU) cores are frequently applied, but PU has a relatively high material cost. More economical material can be achieved by combining PU with fiberglass as a fiberglass reinforced polyurethane elastomer (FRPU) composite. In this study, the sandwich consisting of steel faceplate and FRPU composite core material is applied in the tanker side hull by investigating the structural performance and weight saving analysis using finite element analysis (FEA). Four sandwich side hull models using different stiffener configurations are compared with the conventional stiffened plate model. The result shows the promising SPS application in terms of structural strength and weight savings. The remarkable stress reduction, deformation, and structural weight reduction due to SPS application are discussed. Therefore, its weight reduction can increase the ship payload so that ship operations will be cost-effective.

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Section: Comparison Of Deformationmentioning

confidence: 83%

Section: Comparison Of Deformationmentioning

confidence: 99%

Study of sandwich panel application on side hull of crude oil tanker

et al. 2021

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“…SPS plates, comprising two metal plates bonded to a continuous elastomer core, form a much stiffer and stronger system than a single stiffened metal plate, preclude local buckling and eliminate the need for closely spaced discrete stiffeners (Brooking and Kennedy, 2004;Kennedy et al, 2003;Riks and Rankin, 2002). In flexure, the plates act as flanges and the core as the web (Kenned et al, 2002).…”

Section: Introductionmentioning

confidence: 98%

Numerically simulating the sandwich plate system structures

Guan

Liu

et al. 2010

J. Marine. Sci. Appl.

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Sandwich plate systems (SPS) are advanced materials that have begun to receive extensive attention in naval architecture and ocean engineering. At present, according to the rules of classification societies, a mixture of shell and solid elements are required to simulate an SPS. Based on the principle of stiffness decomposition, a new numerical simulation method for shell elements was proposed. In accordance with the principle of stiffness decomposition, the total stiffness can be decomposed into the bending stiffness and shear stiffness. Displacement and stress response related to bending stiffness was calculated with the laminated shell element. Displacement and stress response due to shear was calculated by use of a computational code write by FORTRAN language. Then the total displacement and stress response for the SPS was obtained by adding together these two parts of total displacement and stress. Finally, a rectangular SPS plate and a double-bottom structure were used for a simulation. The results show that the deflection simulated by the elements proposed in the paper is larger than the same simulated by solid elements and the analytical solution according to Hoff theory and approximate to the same simulated by the mixture of shell-solid elements, and the stress simulated by the elements proposed in the paper is approximate to the other simulating methods. So compared with calculations based on a mixture of shell and solid elements, the numerical simulation method given in the paper is more efficient and easier to do.

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“…In this paper, the vibration-based damage identification is carried out on a sandwich plate, which is designed for the side-shell (hull) of a 100 TEUS container ship using the Finite Element Method (FEM). This sandwich plates consisted of the steel faceplates and the polyurethane elastomer cores [8,28,29]. The investigated sandwich plate types have met Lloyd's Register (LR) regulations [30] and have been commercially used in the shipping industry.…”

Section: Introductionmentioning

confidence: 99%

Vibration-based damage identification for ship sandwich plate using finite element method

et al. 2020

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The sandwich plate can be used to replace the conventional steel stiffened plates on the ship’s hull structure. By using the sandwich plate, not only the stiffness of the plate can be increased but also the overall ship weight can be reduced, as well as the ship payload can be increased. The sandwich plate should be accompanied by the damage identification system to prevent ship structural failure. In this paper, the global damage identification method, which is based on the vibration analysis, is investigated. For that purpose, the vibration-based damage identification using the Finite Element Method (FEM) is explored. The variables being investigated are the damage sizes, damage locations, and the boundary conditions which affect the natural frequencies of the structures. The sandwich plate considered in this study consisted of steel faceplates with the polyurethane elastomer core, which has been checked to meet Lloyd’s register, an international maritime standard. From the analysis, it is found that the fully clamped boundary conditions accompanied by high vibration modes are more sensitive to the presence of artificial damage. The changes in the natural frequencies can be used as a reference to identify the size and location of damage in the sandwich plate.

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An Innovative "No Hot Work" Approach to Hull Repair on In-Service FPSOs Using Sandwich Plate System Overlay

Cited by 12 publications

References 0 publications

Study of sandwich panel application on side hull of crude oil tanker

Study of sandwich panel application on side hull of crude oil tanker

Numerically simulating the sandwich plate system structures

Vibration-based damage identification for ship sandwich plate using finite element method

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