Design Optimization and Non-Linear Buckling Analysis of Spherical Composite Submersible Pressure Hull

Imran, Muhammad; Shi, Dongyan; Tong, Lili; Waqas, Hafiz Muhammad; Muhammad, Riaz; Uddin, Muqeem; Khan, Asghar

doi:10.3390/ma13112439

Cited by 15 publications

(4 citation statements)

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“…The physical meaning of strength ratio R is safety factor, and higher strength ratio corresponds to higher safety margin. The Tasi-Wu strength failure criterion, which is widely used in the field of composite materials [28]- [30], is selected to examine the strength of the composite leaf springs. The single-layer strength ratio of composite materials can be…”

Section: Strength Analysis Of the Composite Leaf Spring Under The Constraint Of The Stiffnessmentioning

confidence: 99%

Stiffness Prediction and Analysis of Composite Leaf Springs

et al. 2021

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Composite leaf springs represent a key application of composite materials in the field of automotive lightweight materials. Stiffness, as a critical parameter of composite leaf springs, is closely related to the handling stability and ride comfort of automobiles. Therefore, this paper proposes an explicit theoretical model, which can consider the anisotropy of composite materials and detailed structure of the leaf spring, to predict the stiffness based on the law of energy conservation. The obtained results are verified against the results of the finite element method and bench test of basalt/epoxy samples. Moreover, the influence of the relevant design parameters on the stiffness is analyzed to provide guidance for the stiffness matching of composite leaf springs. The thickness of the composite leaf spring considerably influences its stiffness. As a key parameter representing the bearing capacity, the strength is closely related to the reliability of leaf springs. Based on the Tasi-Wu strength failure criterion, the influence of the relevant design parameters on the strength ratio of a composite leaf spring is analyzed under the constraint of stiffness. An increase in the width of the composite leaf spring enhances its bearing capacity when the stiffness is required to be within a certain range.INDEX TERMS Automotive lightweight, composite leaf spring, stiffness prediction, finite element method, theoretical model.

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Section: Strength Analysis Of the Composite Leaf Spring Under The Constraint Of The Stiffnessmentioning

confidence: 99%

Stiffness Prediction and Analysis of Composite Leaf Springs

et al. 2021

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“…Considering the loading conditions of spherical pressure hulls used in the deep sea, studies have been published on the crushing/buckling characteristics of spherical shell structures subjected to uniformly distributed compressive loads from the outside [6][7][8][9][10][11]. In addition to theoretical studies, including linear and nonlinear considerations, the finite element method (FEM) has been used to conduct detailed studies on the crushing/buckling characteristics of spherical pressure hulls [12][13].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Spherical Deep-Sea Pressure Structures by Integral Hydrobulge Forming with Triangular Patch Polyhedrons

Jing,

Kong,

Guan

et al. 2024

IJMEA

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Manned pressure shells subjected to deep-sea pressure are designed with a spherical shell structure because they are subjected to perfectly symmetrical pressures. A spherical pressure shell has excellent mechanical properties against deep-sea pressure; therefore, it has the advantage of relatively good buckling properties. However, there are high demands on the processing accuracy of spherical pressure shells, such as thickness distribution and roundness. Even when a small asymmetrical element is present, the buckling characteristics under deep-sea pressure are significantly reduced. In this paper, we propose a new type of spherical pressure shell composed of multiple triangular-plate parts and an integral hydrobulging forming (IHBF) method to process it. Specifically, multiple triangular metal plate parts were prepared and welded along the right side to form a preformed box. A spherical pressure shell was plastically formed by applying water pressure to the interior of the preformed box, causing it to expand outward. For verification, an actual molding experiment was conducted using a spherical pressure shell with a design radius of 250 mm as the research object. The measurement of the outer surface shape of the formed spherical pressure shell showed that the radius value of the spherical pressure shell was 246.52 mm, the error from the design radius was 1.39%, the roundness of the spherical surface was 3.81 mm, and the maximum reduction rate of the plate thickness was 3.2%. Therefore, the processing quality of the proposed IHBF method was confirmed to be high. Buckling analysis was performed by applying a uniformly distributed external pressure to simulate the deep-sea pressure. Compared with the conventional spherical shell structure, the crushing/buckling load of the spherical pressure shell processed by the IHBF method proposed herein is affected by work hardening owing to plastic forming, local defects, and welding line. The effect of the size is relatively small.

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“…Liang et al [20] presented the optimization design of a composite cylindrical shell under hydrostatic pressure. Imran et al [21,22] conducted the optimization of a composite pressure-hull for increasing the buckling load factor and reducing the Buoyancy Factor (B.F). Moreover, Helal et al [10,11,23] conducted the optimization analysis on a stiffened composite pressure-hull to minimize B.F.…”

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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Design Optimization and Non-Linear Buckling Analysis of Spherical Composite Submersible Pressure Hull

Cited by 15 publications

References 50 publications

Stiffness Prediction and Analysis of Composite Leaf Springs

Stiffness Prediction and Analysis of Composite Leaf Springs

Mechanical Properties of Spherical Deep-Sea Pressure Structures by Integral Hydrobulge Forming with Triangular Patch Polyhedrons

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

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