Analysis Of Bearing Capacity Of Cylindrical Pressure Shell Under Impact

With the rapid development of today's world economy,the resources on land have fallen far short of human development needs,and countries all over the world have set their sights on the vast ocean.Due to its potential capabilities and outstanding role,submersibles are indispensable tools in the process of human exploration of the unknown world on the seabed,and a powerful weapon for humans to explore the ocean,use the ocean,and protect the ocean.At present,manned deep-sea detectors have been widely used in various marine exploration projects in various countries.The pressure compartment of the submarine is the most direct application of the cylindrical pressure shell in actual engineering.Regardless of whether it is a submarine or a submersible,the pressure shell plays the role of withstanding deep water pressure,ensuring the normal operation of personnel and various equipment in the cabin,and at the same time providing the main buoyancy.Common submersible pressure shell structure types are generally sphere,cylinder,cone,ellipsoid,or a combination of them.Collision or impact is one of the most common accidents of submersibles and one of the hotspots in structural research.Based on the above reasons,this paper studies the bearing capacity of the cylindrical compression structure under impact.Based on the finite element simulation method and the combination of relevant specifications,the carrying capacity of the submersible was checked,and its carrying capacity under collision or impact was analyzed.The main research contents are as follows:(1)It summarizes the methods of ship collision and the analysis of the bearing capacity of the cylindrical pressure shell,and summarizes the form and analysis method of the impact load of the cylindrical pressure shell;(2)Determine the mesh size when using finite element simulation,and introduce the advantages of titanium and its alloys,as well as the material properties and state equations of the titanium alloy TC4 used in this study;(3)Based on the theoretical basis of relevant specifications,the strength and stability of the cylindrical pressure shell,hemispherical head pressure shell and combined pressure shell are simulated using finite element simulation methods,and the calculation results are calibrated nuclear.And compare the strength and stability of a single cylindrical pressure-resistant structure with the overall strength and stability,analyze the difference between the two and summarize the reasons;(4)The impact of impact speed,position and angle on the impact resistance of the cylindrical pressure shell is analyzed;(5)Analyze and calculate the dynamic characteristics of the cylindrical compression shell under different impact loads,and study the effect of length and ribs on the impact resistance of the cylindrical compression shell.On this basis,the following conclusions are drawn:(1)Under the impact load,the deformation of the cylindrical compression shell will undergo four stages: elastic deformation;axisymmetric deformation;non-axisymmetric deformation;dynamic failure buckling.The critical dynamic buckling load is only the minimum load for non-axisymmetric deformation of the cylindrical shell.When the impact load is greater than the critical dynamic buckling load,the cylindrical shell still has the ability to withstand the load;(2)Under the impact load,the length of the cylindrical shell and the presence or absence of ribs will affect its deformation.Under certain load,the stiffness of the rib is sufficient.The longer the length,the stronger the impact resistance of the ribbed cylindrical shell.(3)In the event of a collision,the collision speed,position and angle will affect the impact resistance of the cylindrical pressure shell structure;...