Abstract
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.
Highlights
Optimization plays an important role in obtaining the best composite hull with high efficiency and safe use of materials
Objectives of Optimization The buoyancy factor (B.F) is defined as weight to buoyancy ratio (W/B) which is the most important factors related to the structural efficiencies of submarine pressure hull [68]
The optimization is performed for sandwich composite deep submarine pressure hull at extreme depths using T700/Epoxy composite and shallow-to-moderate depths using B(4)5505/Epoxy
Summary
Optimization plays an important role in obtaining the best composite hull with high efficiency and safe use of materials. Pelletier and Vel [10] presented a multi-objective design optimization methodology for a laminate composite materials. Fathallah et al [12,13,14,15] investigated the optimization of composite pressure hull for both maximizing the buckling load capacity and minimizing the buoyancy factor. Messager et al [18] presented the optimum design of autonomous underwater vehicles They investigated the optimal lamination design of an un-stiffened thin composite underwater vessels subjected to buckling. Walker and Smith [24] presented a multi-objective optimization of a composite structures for minimizing both weight and deflection. Kalantari et al [27] investigated the multi-objective optimization of T700Scarbon/S-2 glass fiber-reinforced epoxy hybrid composites to minimize the weight and cost of laminates. Lopatin and Morozov [38] presented an analytical solution for
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