ABSTRACT
Deep submersible is an active deep submersible device with the capability of underwater observation and operation. It plays an irreplaceable role in the exploration of marine resources, the development of seabed and the salvage and life-saving of submarines and ships in accidents. Therefore, the research of deep submersible is very important. Accidents such as collision and reef-striking may occur during the manufacture and use of deep submersible, which may result in large pit damage and greatly reduce the ultimate bearing capacity of pressure hull. Research on residual strength of Spherical pressure hull with local damage can provide theoretical support for safety accidents. In this paper, the finite element software is used to calculate the ultimate bearing capacity of spherical compressive shells with and without local damage, and the influence of local damage on the stability of compressive shells is analyzed. At the same time, the influence of dimension parameters on the ultimate load-carrying capacity and failure mode is analyzed by designing local damage with different depth and length.
