Study On Hydrostatic Strength Of Carbon Fiber Buoyancy Material

From ancient times to the present,human exploration of the ocean has not been interrupted.Whether it is rich resources or important strategic perspectives,the development of marine exploration and detection is of great significance.Underwater buoyancy materials are widely used in various marine equipment such as surface buoys,offshore drilling platforms,and underwater vehicles.And they are indispensable engineering materials for promoting marine exploration.The weight reduction and enhancement of underwater buoyancy materials can greatly improve the endurance and payload of underwater vehicles,which is the top priority of the current development of underwater vehicles.Hollow glass microsphere buoyancy material is the most widely used buoyancy material at present,but its research at home and abroad has fallen into a bottleneck,and it is difficult to further reduce the density.And from the current point of view,although the domestic research on hollow glass microspheres is developing rapidly,there is still a big gap with foreign countries.Therefore,the development of a new type of buoyancy material with light weight and high strength to meet the marine conditions is an important way to break the neck problem of buoyancy materials.In this paper,a new type of carbon fiber buoyancy material structure is designed,which is composed of Carbon Fiber Reinforced Plastic(CFRP)tube,epoxy resin and end cap.As the main bearing part of carbon fiber buoyancy material,the strength and stability of CFRP tube determine the upper and lower limits of carbon fiber buoyancy material respectively.In this paper,the ply design,aspect ratio and preparation process of CFRP tubes are explored.The main parameters affecting the hydrostatic pressure performance of CFRP tubes are studied from the perspectives of simulation design and preparation process.Based on the research of CFRP tube,this paper proposes a new carbon fiber buoyancy material,which is filled with epoxy resin to suppress the buckling failure of carbon fiber tube.In the research process,ABAQUS software was used to establish the simulation model of carbon fiber buoyancy material,and the simulation calculation under water pressure environment was carried out to analyze its water pressure failure strength and failure mode.During the study,it was found that the axial length of the buoyancy material and the number of unit cells in the section had different effects on the water pressure strength.By changing the transverse and longitudinal dimensions of the buoyancy material,the influence of the number of cells and the longitudinal length on the performance of the carbon fiber buoyancy material is studied.At the same time,the mechanical properties of carbon fiber tubes at various positions of buoyancy materials are analyzed,and the causes of structural failure are analyzed.The water pressure resistance of the structure is further optimized by means of wall thickening and built-in reinforcement.In order to verify the accuracy of the above simulation calculation,this paper carried out the research on the preparation process of carbon fiber buoyancy material,prepared the carbon fiber buoyancy material structure with stable performance,and verified it in the high-pressure simulation device.Through the comparison between simulation and experiment,the correctness of the simulation model is verified,and the failure strength and failure mode are analyzed and summarized.Finally,the effect of water absorption of epoxy resin on the hydrostatic strength of carbon fiber buoyancy materials was investigated.The water absorption and hydrostatic strength of carbon fiber buoyancy material were tested by water absorption experiment.The relationship between the water absorption of the structure and the hydrostatic pressure strength of the carbon fiber buoyancy material is given,and the rationality of the application of the carbon fiber buoyancy material is verified.