The Mechanical and Water Absorption Properties of Carbon Fiber Buoyancy Materials Under Hydrostatic Pressure

Key Points

• The research aims to investigate the mechanical and water absorption properties of carbon fiber buoyancy materials under hydrostatic pressure.
• Developed new carbon fiber buoyancy materials using composite tubes.
• Established a finite element model based on Hashin and Yeh failure criteria.
• Conducted experimental validation of the model results.
• Performed a water absorption test under 12.5 MPa for 60 days.
• The static strength of CFBM is primarily limited by buckling failure at the edges of the composite tubes.
• Maximum water absorption rate was observed at 0.59%.
• Static pressure strength decreased by only 7.97%.
• CFBM outperformed traditional materials in both static strength and density at depths of 1000 meters.