Buckling of segmented toroids under external pressure

Zhang, Jian; Di, Chenyang; Wang, Fang; Tang, Wenxian

doi:10.1016/j.oceaneng.2021.109921

Cited by 16 publications

(7 citation statements)

References 31 publications

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“…Zhao et al [2][3][4][5][6] studied the welding residual stress of a TC4 titanium alloy plate via numerical simulation, and Chang et al [7][8][9] conducted numerical simulations and experimental studies on the ultimate strength of thin-walled steel spherical shells with an inner diameter of 1000 mm under the influence of welding residual stress. Zhang et al [10][11][12][13][14] conducted numerical simulations and experimental studies on the buckling modes of various types of steel annular pressure hulls, such as egg-shaped hulls. Li et al [15][16][17][18][19][20][21][22] studied the mechanical properties of welded shell structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on the Ultimate Bearing Capacity of Titanium Alloy Pressure Spherical–Cylindrical-Combined Shells

Wang,

Guo,

Zhang

et al. 2024

Metals

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Titanium alloy pressure spherical–cylindrical shells enable the effective utilization of the strength of spherical and cylindrical pressure-resistant shell components. In this study, a numerical simulation of the residual stress of a titanium alloy butt-welding plate was conducted by employing sequential coupling and a temperature heat source model. The results of welding residual stress analysis agreed well with the experimental results reported in the literature. Subsequently, the welding residual stress of a titanium alloy pressure spherical–cylindrical shell was calculated and analyzed using the same method. Finally, the influence of residual stress on the ultimate bearing capacity of the shell was assessed. On the inner surface of the shell, the horizontal welding residual tensile stress, perpendicular to the weld path, exhibited a bimodal distribution. The longitudinal welding residual tensile stresses were higher than the horizontal welding residual stress. Near the weld on the outer shell surface, higher longitudinal welding residual tensile stresses existed, whereas the horizontal welding residual stress was compressive. Both the inner and outer shell surfaces exhibited significant longitudinal residual tensile stresses along the weld path, though residual compressive stresses existed on both surfaces. The influence of welding residual stress on the ultimate load-bearing capacity of the shell was minimal.

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Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on the Ultimate Bearing Capacity of Titanium Alloy Pressure Spherical–Cylindrical-Combined Shells

Wang,

Guo,

Zhang

et al. 2024

Metals

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“…Moon et al [37] studied the buckling behavior of a composite cylinder subjected to hydrostatic pressure. Zhang et al [38] examined the buckling behaviours of six segmented toroids and a continuous toroid under external pressure. The results showed a good agreement between the experimental observations and the numerical estimations.…”

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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“…In recent years, many scholars have carried out more research work on the form of pressure-hulls for deep-sea equipment. New kind of geometries for pressure hulls, such as toroid-shaped shell (Zhang et al, 2021), egg-shaped shell (Zhang et al, 2017;Zhang et al, 2022a) and barrel shapes shell (Zhang et al, 2022b), have received considerable attention because of their low imperfection sensitivity, rational hydrodynamics, and high loading capacity. However, the above studies for the deep-sea pressure hulls did not consider the damage evolution of the materials in the numerical investigation, and the fracture mechanism and failure strain were neglected.…”

Section: Introductionmentioning

confidence: 99%

Fracture mechanism and failure strain of TA31 titanium alloy for deep-sea pressure hulls based on continuum damage mechanics

Zhang¹,

Wan²

2023

Front. Mater.

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Titanium alloys has high fatigue resistance, high corrosion resistance, high temperature resistance, and other excellent properties, and have been widely used in deep-sea equipment and aviation industries. In this paper, the fracture mechanism and failure strain of TA31 titanium alloy, which has been widely used in deep-sea equipment, were studied experimentally and numerically in different stress states. Considering the pressure sensitivity, the Modified Johnson-Cook (MJC) model and the Bonora damage model were used to study the fracture behavior. In order to obtain the parameters of models, four types of specimens under different stress triaxiality were conducted, and a hybrid experimental-numerical approach was employed in this paper. Then, the coupled constitutive elastic–plastic-damage model was developed and implemented in ABAQUS explicit finite element analysis (FEA) code. Finally, to validate the suggested model, FEA simulation was carried out and compared with the experimental results. The comparison revealed that the Bonora model with constant parameters was not enough to predict the failure strain. The damage parameters were sensitive to the stress triaxiality. In addition, the fracture morphology was observed by scanning electron microscope (SEM), which revealed the micro-mechanism of failure for TA31 titanium alloy. It is concluded that a higher stress triaxiality and shear mechanism lead to lower plastic deformation, and will inhibit the void growth on the damage evolution.

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Buckling of segmented toroids under external pressure

Cited by 16 publications

References 31 publications

Effect of Residual Stress on the Ultimate Bearing Capacity of Titanium Alloy Pressure Spherical–Cylindrical-Combined Shells

Effect of Residual Stress on the Ultimate Bearing Capacity of Titanium Alloy Pressure Spherical–Cylindrical-Combined Shells

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

Fracture mechanism and failure strain of TA31 titanium alloy for deep-sea pressure hulls based on continuum damage mechanics

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