Structural Design And Finite Element Analysis Of Carbon Fiber Wound Pressure Vessel

The filament wound composite pressure vessel is usually made of metallic or non-metallic materials with inner lining and outer wound high strength carbon fiber or glass fiber reinforced composite materials.The composite pressure vessel has been widely used in aerospace,military and industrial fields for its light weight,high strength,safety and reliability.As the pressure vessel of composite material is very complex in geometry,material and structure,it is very difficult to achieve the goal by using theoretical analysis method,while the finite element structure analysis method is a feasible solution at present.With the development of computer technique and the maturity of finite element method,numerical calculation method has become one of the important methods to study the pressure vessel of composite materials.The application of finite element numerical analysis and optimization technology to the design of the wound compound pressure vessel can improve the reliability of the structural design,the performance of the pressure vessel,and greatly shorten the product design cycle and the cost of research and development.This paper mainly focuses on the following aspects of carbon fiber winding composite pressure vessel:(1)Determine the structural design of carbon wound composite pressure vessel.According to grid theory,the structure of carbon fiber winding composite pressure vessel lining and composite material winding layer of this type are designed by combining the condition of container volume with the criteria of fiber winding technology,Determine the geometrical size of the lining,spiral winding layer winding Angle is 12.7 ° and the ring into the winding layer winding Angle is 90 ° and fiber layer a total thickness of 5.91 mm.(2)Using the parametric design language(APDL)of ANSYS,the finite element parametric models of the container under five working conditions are established,the angle and thickness of the fiber layer in the head of the simulation model are changed.Finite element numerical calculation and analysis of the mechanical properties of the vessels under five working conditions are respectively carried out,and it is proved that the composite pressure vessel is safe and reliable.Optimizing the self-tightening pressure of vessels based on DOT-CFFC Criterion,thus it is concluded the optimum self-tightening pressure is 42.5Mpa.Through the comparative analysis of the calculation results before and after tightening the vessel,it is concluded that the maximum stress in the fiber layer increases by 30% under working pressure,the equivalent force of the internal gallbladder was reduced by 32%,the bearing capacity and stability of the container are improved.(3)According to DOT-CFFC,the mathematical model of optimal design of composite pressure vessel is established.Using the volume of the objective function,the toroidal and spiral to the fiber layer thickness as independent variables,the container liner stress size and fiber layer as the condition,the winding fiber ring and spiral layer thickness are optimized calculation,determine the winding fiber ring to the best and spiral layer thickness of reducing the volume of the fiber.