Pressured shell is an important structure of deep-sea submersible, once the pressure shell structural damage, watertight cabin water leakage, will cause battery short circuit, electronic equipment failure and even electronic control system collapse resulting in the loss of submersible accidents. Therefore, it is an important task to design pressured shell with sufficient strength stability and as light weight as possible. Ring-rib cylindrical pressured shell has the most extensive application in multi-purpose submersibles, and its advantages are easy to process and easy to arrange the equipment in the tank. According to the actual use requirements, the pressured shell needs to open one or more through holes, and the holes are mainly concentrated on the heads at both ends, which are usually used for the penetration of equipment cables to provide energy and information transmission. According to the use requirements of submersible, considering the principle of minimum weight and the requirements of internal equipment layout, the deep tank with working depth of 2000m is designed. The cylindrical shell with flat cover head and titanium alloy with higher strength were used for the end of the pressured shell to obtaine the optimal structure of the pressured shell.
Why choose titanium alloy material as pressure shell
The advantages of titanium alloy materials are light weight (density of about 60% of steel) high strength (yield limit up to 800MPa or more), seawater corrosion resistance, non-magnetic. Therefore, despite the shortcomings of high welding requirements, complex processing and high price, titanium alloy materials can still be used as the preferred material for the pressured shell of deep submersible vehicles.
Structural of titanium alloy pressured shell
For deep submersible vehicles, the depth of diving is large and the pressure is large, resulting in the thickness of the required pressured shell is relatively thick. In actual use, the two ends of the pressured shell and the head are connected to form a watertight chamber, so the end of the cylindrical shell is fully constrained by six degrees of freedom when setting constraints.
The structural of the pressured shell Cover
pressure experiment
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For the pressured shell of large depth submersible, high-strength, low-density, corrosion-resistant titanium alloy should be the preferred material.
Key words: pressured shell ; titanium alloy; structure design; pressure experiment
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