| Submarine is an important weapon in modern war.The submersible depth of the pressure-resistant hull is related to its usability and safety in the deep sea.With the rapid development of weapons and equipment in various countries,the design of submarine is also moving towards the direction of large submergence depth,which puts forward higher requirements for the strength stability and economic performance of the pressure-resistant shell.However,due to the layout of the cabin,the design trend of the existing ring-ribbed cylindrical shell structure is developing towards a longer and wider direction,and the instability in the sea water is an important factor that limits its diving depth.In view of the fact that instability is the main cause of the failure of the existing structure,a new series spherical pressure shell with better stability is designed in this paper,which combines the spherical structure with the circular ribbed cylindrical shell and discusses several factors affecting the strength stability of the structure,thus solving the stress concentration problem at the joints.The strength stability of the series spherical pressure shell and the traditional ring-ribbed cylinder is checked,which provides the basis for the design of the pressure shell and has important practical significance.The main tasks are as follows:The strength of a complete spherical pressure resisting shell is analyzed.According to the characteristics of the spherical structure under uniform pressure,the formula for calculating the critical buckling load of spherical shell is derived by taking a slat beam through the spherical center.Then,the difference between the strength and stability of the spherical shell and the intact spherical shell is obtained by using the finite element method,which provides the basis for the optimization of the new series spherical shell.A method for calculating the strength and critical buckling load of a conventional circular-ribbed cylindrical shell is presented.By means of finite element modeling,the stress and critical buckling load of different parts of the structure are checked,and the strength stability value of the traditional ring-ribbed cylindrical shell is determined.The finite element model of the circular ribbed cylindrical shell with equal volume series ball structure is established and the maximum stress and critical buckling load of the series ball structure are solved.Aiming at the stress concentration at the joint of ball and column,an optimization scheme is put forward.Using a large number of numerical simulation,the different optimization parameters: such as the ball over the column Angle changes add to the stiffener ring,add in stretch wall and using the circular arc transition case series ball structure strength and buckling critical load calculation,analysis of the various parameters change effect on the mechanical properties of new series ball structure,and synthetically considering structure quality joint circular arc transition and the in-band and wall series pressure spherical shell design.The problem of stress concentration at the joint of ball and column combined structure is solved effectively.The ultimate depth of submergence is calculated.It provides a theoretical basis for the design of new series spherical pressure housingIn this paper,a new series spherical structure is designed and the stress concentration phenomenon at its connection is optimized,so that it can reach a greater depth than the ringribbed cylindrical shell,and give full play to the strength of the material,which has certain reference value for the design and optimization of deep-sea pressure shell. |
