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The pressure hull is the primary element of submarine, which withstands diving pressure and provides essential capacity for electronic systems and buoyancy. This study presents a numerical analysis and design optimization of sandwich composite deep submarine pressure hull using finite element modeling technique. This study aims to minimize buoyancy factor and maximize deck area and buckling strength factors. The collapse depth is taken as a base in the pressure hull design. The pressure hull has been analyzed using two composite materials, T700/Epoxy and B(4)5505/Epoxy, to form the upper and lower faces of the sandwich composite deep submarine pressure hull. The laminated control surface is optimized for the first ply failure index (FI) considering both Tsai–Wu and maximum stress failure criteria. The results obtained emphasize an important fact that the presence of core layer in sandwich composite pressure hull is not always more efficient. The use of sandwich in the design of composite deep submarine pressure hull at extreme depths is not a safe option. Additionally, the core thickness plays a minor role in the design of composite deep submarine pressure hull. The outcome of an optimization at extreme depths illustrates that the upper and lower faces become thicker and the core thickness becomes thinner. However, at shallow-to-moderate depths, it is recommended to use sandwich composite with a thick core to resist the shell buckling of composite submarine pressure hull.
Mahmoud Helal; Huinan Huang; Defu Wang; Elsayed Fathallah. Numerical Analysis of Sandwich Composite Deep Submarine Pressure Hull Considering Failure Criteria. Journal of Marine Science and Engineering 2019, 7, 377 .
AMA StyleMahmoud Helal, Huinan Huang, Defu Wang, Elsayed Fathallah. Numerical Analysis of Sandwich Composite Deep Submarine Pressure Hull Considering Failure Criteria. Journal of Marine Science and Engineering. 2019; 7 (10):377.
Chicago/Turabian StyleMahmoud Helal; Huinan Huang; Defu Wang; Elsayed Fathallah. 2019. "Numerical Analysis of Sandwich Composite Deep Submarine Pressure Hull Considering Failure Criteria." Journal of Marine Science and Engineering 7, no. 10: 377.
Among the most important problems confronted by designers of submarines is to minimize the weight, increase the payload, and enhance the strength of pressure hull in order to sustain the hydrostatic pressure and underwater explosions (UNDEX). In this study, a Multiple Intersecting Cross Elliptical Pressure Hull (MICEPH) subjected to hydrostatic pressure was first optimized to increase the payload according to the design requirements. Thereafter, according to the optimum design results, a numerical analysis for the fluid structure interaction (FSI) phenomena and UNDEX were implemented using nonlinear finite element code ABAQUS/Explicit. The propagation of shock waves through the MICEPH was analyzed and the response modes (breathing, accordion and whipping) were discussed. Furthermore, the acceleration, displacement and failure index time histories at different locations were presented. The results showed that the greatest acceleration occurred in the athwart direction, followed by the vertical and longitudinal directions. Additionally, the first bubble pulse has a major effect on athwart acceleration. Moreover, the analysis can be effectively used to predict and calculate the failure indices of pressure hull. Additionally, it provides an efficient method that reasonably captures the dynamic response of a pressure hull subjected to UNDEX.
Mahmoud Helal; Huinan Huang; Elsayed Fathallah; Defu Wang; Mohamed Mokbel Elshafey; Mohamed Ali. Numerical Analysis and Dynamic Response of Optimized Composite Cross Elliptical Pressure Hull Subject to Non-Contact Underwater Blast Loading. Applied Sciences 2019, 9, 3489 .
AMA StyleMahmoud Helal, Huinan Huang, Elsayed Fathallah, Defu Wang, Mohamed Mokbel Elshafey, Mohamed Ali. Numerical Analysis and Dynamic Response of Optimized Composite Cross Elliptical Pressure Hull Subject to Non-Contact Underwater Blast Loading. Applied Sciences. 2019; 9 (17):3489.
Chicago/Turabian StyleMahmoud Helal; Huinan Huang; Elsayed Fathallah; Defu Wang; Mohamed Mokbel Elshafey; Mohamed Ali. 2019. "Numerical Analysis and Dynamic Response of Optimized Composite Cross Elliptical Pressure Hull Subject to Non-Contact Underwater Blast Loading." Applied Sciences 9, no. 17: 3489.