Numerical Analysis and Dynamic Response of Optimized Composite Cross Elliptical Pressure Hull Subject to Non-Contact Underwater Blast Loading

Helal, Mahmoud; Huang, Huinan; Fathallah, Elsayed; Wang, Defu; Elshafey, M.; Ali, Mohamed A. E. M.

doi:10.3390/app9173489

Cited by 11 publications

(3 citation statements)

References 54 publications

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“…Several pressure-hull arrangements that can be used in submersible bodies are illustrated in Fig. 2 [46][47][48]. The ring-stiffened hulls have better structural performances and are commonly used in submarines and underwater vehicles [49,50].…”

Section: Shapes and Materials Requirements For Submarine Pressure-hullmentioning

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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Section: Shapes and Materials Requirements For Submarine Pressure-hullmentioning

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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“…In conclusion, it is known that both man-made attacks and accidents can yield to explosions and fire loads that could push the constructional materials, and thus the structures, to their capacity limits. Blast loads analyses, in this regard, are reported in [18][19][20], while fire effects on a tunnel structure are analyzed in [21].…”

Section: Contentsmentioning

confidence: 99%

Special Issue on “Buildings and Structures under Extreme Loads”

2020

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“…The techniques for protection against explosion hazards have attracted some recent attention [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Mana [17] studied the effects of an explosion on a building with and without a soil barrier.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis for Critical Structures Protection against Blast Loading Using Metallic Panels

Alogla

Helal

Elshafey³

et al. 2020

Applied Sciences

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The need for building protection against blast loads is a crucial issue nowadays due to the escalating threat of terrorist attacks, which affect people’s lives and critical structures. Consequently, design of protective panels to segregate building façades from the effect of a nearby explosion is required. Such design mainly depends on the ability of protective panels to mitigate and diffract the blast wave before reaching building façades. Five protective panel models with different designs, referred to as the Combined Protection System (CPS), are introduced in this paper. The main objective of this research was to achieve a design that could sustain a blast load with minimum plastic deformations. The introduced CPS designs included two steel plates linked by connector plates. The CPS dimensions were 3 m × 3 m × 0.35 m, representing length, width, and height, respectively. After that, the successful panel design was supported by placing these panels onto a masonry wall in different configurations. The protective panels were tested against 50 kg of trinitrotoluene (TNT) with a standoff distance of one meter. The final run of the optimum model was carried out using a blast load equivalent to 500 kg of TNT. The air–structure interactions were simulated using finite element analysis software called “ANSYS AUTODYN”, where the deformation of the panel was the governing parameter to evaluate the behavior of different designs. The analysis showed minimum deformation of the CPS design with vertical and horizontal connecting plates in a masonry wall distanced at 500 mm from the panel. However, the other designs showed promising results, which could make them suitable for critical structural protection on different scales.

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Numerical Analysis and Dynamic Response of Optimized Composite Cross Elliptical Pressure Hull Subject to Non-Contact Underwater Blast Loading

Cited by 11 publications

References 54 publications

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

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

Special Issue on “Buildings and Structures under Extreme Loads”

Numerical Analysis for Critical Structures Protection against Blast Loading Using Metallic Panels

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