Effect of corrosion thinning on depth of operation: Case study of an HY-80 steel submarine pressure hull

Viljoen, Hermanus Carl; Mahomed, Nawaz; Cupido, Llewellyn H.; Mitchell, Greg P.

doi:10.1016/j.marstruc.2021.103103

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…Due to the giant size of the submarine pressure shell, local buckling failure can easily occur under external hydrostatic pressure. Therefore, based on welded stiffening ribs, a few strong stiffening ribs (king stiffening ribs) are usually welded to delay the occurrence of local buckling failure [36,37]. The welding process induces varied mechanical properties in different regions of the pressure shell.…”

Section: Introductionmentioning

confidence: 99%

Failure Behavior of Corrugated Pressure Cylindrical Shells with Variable Wall Thickness under Uniform External Pressure

Sun,

Zhang,

Zhang

et al. 2024

JMSE

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The main load-bearing structure of submarines is the pressure shell. Shell failures are usually caused by high hydrostatic pressure and its own potential geometric imperfections. This paper proposes a cylindrical shell with a strong corrugated stiffening structure. Two theoretically geometrically identical shells are fabricated using CNC machining to ensure the reproducibility and reasonableness of the results. Firstly, the point cloud data of all the geometric parameters of the corrugated pressure cylindrical shells were obtained using a 3D scanner. Geomagic Control X 3D inspection software was used to determine the geometric deviations of the shells. Geometric reconstruction was performed using Geomagic Design X reverse modeling software to capture potential imperfections of the shells. The aluminum shells were then welded and placed in the pressure chamber. Failure loads were obtained for all shells by constant water injection and pressurization. Considering the confined nature of the pressure chamber, a nonlinear finite element analysis of the corrugated pressure cylindrical shell was carried out using Abaqus/Riks, taking into account actual fabrication imperfections. Finally, the failure behavior of the shells under uniform external pressure was determined. The results show that both corrugated pressure cylindrical shells have high machining accuracy. The numerical simulation results of the critical buckling load of the corrugated pressure cylindrical shells were in good agreement with the test results. The corrugated structure has additional advantages in retarding the generation and expansion of shell surface defects. The equilibrium path of the corrugated pressure cylindrical shell can be maintained in a smooth and continuous state, showing stable buckling behavior. This study will provide new inspiration for the structural design and failure prediction of the submarine pressure shell.

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Section: Introductionmentioning

confidence: 99%

Failure Behavior of Corrugated Pressure Cylindrical Shells with Variable Wall Thickness under Uniform External Pressure

Sun,

Zhang,

Zhang

et al. 2024

JMSE

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show abstract

“…The local buckling pressure, overall buckling pressure, and yield pressure were examined. Viljoen et al [30] investigated the effect of corrosion thinning on the collapse pressure hull made of steel and predicted that the submarine hull would buckle at a depth of 567 m when the nominal plate thickness is 25.4 mm, Owing to corrosion thinning, the collapse pressure was reduced by 27 kPa per annum. Bagheri et al [31] applied the genetic algorithm (G.A) method to a multi-objective optimization problem of ring stiffened cylindrical shells.…”

Section: Introductionmentioning

confidence: 99%

Minimizing Buoyancy Factor of Metallic Pressure-Hull Subjected to Hydrostatic Pressure

Helal¹,

Fathallah²,

Alghtani³

et al. 2023

Intelligent Automation &Amp; Soft Computing

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To increase the payload, reduce energy consumption, improve work efficiency and therefore must accordingly reduce the total hull weight of the submersible. This paper introduces a design optimization process for the pressurehull of submarines under uniform external hydrostatic pressure using both finite element analysis (FEA) and optimization tools. A comprehensive study about the optimum design of the pressure hull, to minimize the weight and increase the volume, to reach minimum buoyancy factor and maximum operating depth minimizing the buoyancy factor (B.F) is taken as an objective function with constraints of plate and frame yielding, general instability and deflection. The optimization process contains many design variables such as pressure-hull plate thickness, unsupported spacing, dimensions of long and ring beams and finally the elliptical submersible pressure-hull diameters. The optimization process was conducted using ANSYS parametric design language (APDL) and ISIGHT. The Multi-Island Genetic Algorithm (G.A) is considered to conduct the optimization process. Additionally, parametric analysis is done on the pressure hull to examine the effect of different design variables on the pressure-hull design. As a result, the B.F of the proposed optimal model is reduced by an average of 31.78% compared with Reference Model (RM). Maximum von Mises stress is reduced by 27% as well. These results can be helpful for submarine pressure-hull designers.

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Global Seawater Corrosivity Classification and Visualization Based on ArcGIS Technology

Zhang¹,

Li²,

Ding³

et al. 2023

Lecture Notes on Data Engineering and Communications Technologies

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Effect of corrosion thinning on depth of operation: Case study of an HY-80 steel submarine pressure hull

Cited by 6 publications

References 10 publications

Failure Behavior of Corrugated Pressure Cylindrical Shells with Variable Wall Thickness under Uniform External Pressure

Failure Behavior of Corrugated Pressure Cylindrical Shells with Variable Wall Thickness under Uniform External Pressure

Minimizing Buoyancy Factor of Metallic Pressure-Hull Subjected to Hydrostatic Pressure

Global Seawater Corrosivity Classification and Visualization Based on ArcGIS Technology

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