Variant kinds of reinforced structure in connecting place of internal domed bulkhead and pressure hull have a very large effect on the stress on pressure hull.

In this paper,we analyse the design status for the internal plane bulkhead of the domestic submarine,add and improve the bending moment and shear force formula of the level crossbeam and the vertical beam on the beam bracket.

Optimization design of domed bulkhead with nonaxisymmetry sphere-conical transitional annulated shell;

Elastic-plastic Inherent strain method is proposed to simulate the welding of a thick spherical stem bulkhead of a submarine, which eliminates the deficiency of the thermal Elastic-plastic FEM that only suits for small-scale welding calculations.