Numerical Analysis Of Carbon Fiber Composite Winding Vessel

Fully-wrapped composite cylinder has been widely used in aviation and space industries and military as well as many civil areas. With the advance of science and technology, the higher demands of properties of composite vessels are required. The properties of composite cylinder are heavily affected by its technology parameters, so an important way to improve the properties is to optimize the main technology parameters. Based on ANSYS finite element software we established three dimension finite element model of56L and130L composite cylinders to analysis and optimize the main technology parameters which had big influence on these cylinders’fatigue property and burst pressure.To confirm the biggest compress pressure that can be enforced on the liner when winding fiber on the liner or during solidification process, we first calculated the bucking pressure of liners of different wall thickness. Then we used temper-parameter method to model fiber tension of the ladle body. And calculated compress stress of the ladle body of liner indicated that fiber tension can be effectively exerted by temper-parameter method.Parameters that had big influence on fatigue property of composite cylinders including autofrettage pressure, wall thickness of liner and fiber tension are optimized. And results indicated that when autofrettage pressure was49MPa the cylinders had the best fatigue property and stress distribution. With the increase of wall thickness of liner the fatigue life of cylinders increase too. Under the three fiber tensions we calculated in this paper, composites cylinders have the highest fatigue life when the fiber tension was70-0.5.At last we optimized these technology parameters which had big effect on burst pressure of composites cylinders including fiber tension and ending point of spiral winding fibers. And it could be concluded that under the three fiber tensions we calculated the biggest burst pressures which were94MPa for130L cylinder and95MPa for56L cylinder were reached when the fiber tension was70-0.5. And another conclusion was that the ending points of spiral winding fibers had no direct effect on burst pressure, but if the fibers were ended too early then at the ending point there would be stress concentrating.All the results we calculated matched well with the data of experiment, and they had contributed to the optimize process of technology parameters.