Design Of Encapsulation Of Carbon Fiber Composite Curved Honeycomb Buoyance Structure

With the depletion of land resources,the exploration and exploitation of Marine resources has become an effective way to solve the shortage of resources.The exploitation of Marine resources cannot be separated from deep-sea equipment,which usually provides buoyancy with buoyancy materials.At present,most buoyancy materials are glass beads/epoxy composites,but their high density,poor water pressure resistance and low buoyancy are difficult to meet the technical requirements of deep-sea equipment.Therefore,it is an urgent task to design a buoyancy structure with both low density and high bearing capacity.The curved honeycomb structure is a kind of lightweight sandwich structure with excellent mechanical properties and strong designability,which has been widely concerned and studied by scholars at home and abroad.Compared with the straight wall honeycomb structure,the curved wall honeycomb structure has the advantages of strong buckling ability and high bearing strength.Although the axial compression strength of curved honeycomb is very high,its lateral compression strength is very low,so it needs to be packaged at the end to be used in hydraulic environment.In order to solve this problem,the panel and side wall packaging of carbon fiber honeycomb buoyancy structure is designed and studied by simulation and experiment,and its strength and failure mechanism are analyzed.The first chapter introduces the solid buoyancy material,honeycomb structure and its connection mode,and summarizes the research content and purpose of this paper.In Chapter 2,the influence of panel thickness and layering Angle on the strength of carbon fiber honeycomb buoyancy structure panel under water pressure is studied by mechanical simulation.It is found that when the fiber direction of the outer panel is the same as that of the honeycomb core L,the stress concentration phenomenon is lightest.Meanwhile,when the thickness of the panel reaches 0.64 mm,the simulated strength of the panel can reach20 MPa.In order to verify the accuracy of the simulation results,the optimal model in the simulation was verified by experiment.In Chapter 3,the feasibility of using composite laminates as carbon fiber honeycomb buoyancy structure is studied.Through simulation and experiment,it is found that the strength of using laminates as packaging structure is subject to the interlaminar shear strength of laminates.In order to solve this problem,a chamfered structure is designed in this paper,and the influence of chamfered parameters on the water pressure resistance of the structure is studied.The results show that the stress concentration can be alleviated when the length to width ratio of guide Angle is about 1:2In Chapter 4,based on the idea of equal stiffness design,several compound side wall packaging structures are designed and studied,and their feasibility and the influence of various parameters on their water pressure resistance are studied by simulation.