Ultimate Bearing Capacity Analysis And Experimental Study Of Composite Pressure Shell

As the depth of exploration of submersibles in the ocean continues to increase,the requirements for pressure-resistant structural performance of submersibles are also continuously strengthened.Continuing to use traditional high-quality alloys for the production of pressure-resistant structures can only simply increase the thickness of the structure or add other reinforcing structures,which will increase the weight or volume of the pressure-resistant structure of the submersible,and may be acco MPanied by process defects such as processing cracks.Fiber composite materials have the advantages of high specific strength,high specific modulus,and strong designability.While maintaining a certain pressure resistance of the original structure,it also has an excellent lightweight effect on the overall structure,and has gradually entered the field of view of researchers.This paper takes the carbon fiber composite cylindrical pressure shell as the research object,uses the nonlinear buckling method to calculate the ultimate bearing capacity of the pressure shell,uses the pressure test to verify,and analyzes the influencing factors of the ultimate bearing capacity of the pressure shell.The main research contents and research results of this paper are as follows:(1)Using the combination of linear buckling and nonlinear buckling arc length method in finite element software Abaqus to calculate the ultimate bearing capacity of the structure,the numerical calculation method of the ultimate bearing capacity of the carbon fiber composite cylindrical pressure shell is determined.(2)Carry out the underwater withstand pressure test of the cylindrical pressure shell,and carry out the withstand pressure test on the designed and manufactured cylindrical pressure shell.The dynamic strain acquisition system is used to collect the strain information of the measuring points of the pressure hull,and the strain response of the cylindrical pressure hull under underwater compression is analyzed to verify the correctness of the numerical analysis method.(3)The influence of material parameters,geometric parameters,filament winding methods,and structural parameters related to structural defects on the ultimate bearing capacity of the carbon fiber composite cylindrical pressure shell was studied,and the influence rules of different factors on the ultimate bearing capacity within a certain range were summarized.(4)The influence of the port joint structure and the related parameters of the metal lining structure on the ultimate bearing capacity of the carbon fiber composite cylindrical pressure hull is studied,and the influence law of the relevant structural parameters on the ultimate bearing capacity of the pressure hull is summarized.