NUMERICAL INVESTIGATION OF THE BUCKLING STRENGTH BEHAVIOR OF RING STIFFENED SUBMARINE PRESSURE HULL

Indonesia's territorial sea is one of the most important checkpoints in the submarine world. Most of the global trade should pass through the Straits of Malacca and the shallow waters around the coast of the Indonesian archipelago. This situation makes Indonesia needs submarines that can operate at sea for up to three weeks. However Indonesia has only two old submarines Chakra, as well as some of the Frigate and Corvette to maintain a wide area. The presence of the modern submarine is absolutely necessary to strengthen the protection of the sea territory of Indonesia, especially at points that are considered vulnerable. A growing trend in the design of the submarine proves the need for increasing the level of water depth, especially for the military activities. Moreover, the complexity of modern submarines and their demand for efficiency, safety, and greater reliability, is a challenge for designers in making the design of submarine particular component known as pressure hull. Commonly, the structure of the submarine consists of two hull components, namely the outer hull which is more focused on the influence of the hydrodynamic loads so-called hydrodynamics hull, and the inner hull which is used to withstand hydrostatic pressure when the vessel in diving conditions. Based on the functions that the inner hull is used to withstand the pressure, thus it is identified as a pressure hull.