Computer Aided Analysis of Filament Wound Composite Pressure Vessel with integrated End Domes considering the Change of Winding Angles through the Thickness Direction

摘要

Filament -wound composite pressure vessels are an important high-pressure container, widely applied in the commercial and aerospace industries. The determination of a proper winding angle and thickness is very important to decrease manufacturing difficulties and to increase structural efficiency. In this study possible winding angles considering the slippage between a fibre and a mandrel surface are calculated using geodesic and semi-geodesic path equations. Netting analysis is used for the calculation of hoop and helical thickness of the shell. A balanced symmetric ply sequence for carbon T300/epoxy is considered for the entire pressure vessel. Finite element analyses were performed considering the change of winding angles through the thickness by a commercial FEA code, ANSYS. Different filament wound end domes, i.e., hemispherical, isotensoid (geodesic), constant deviation line (non-geodesic) structures considered for continuous change of the winding angle and thickness at the dome part due to fibre built-up near the metallic boss. Finite element analysis, can predict the deformation of filament wound structures. The results can be utilized to understand structural characteristics of filament wound pressure vessels with integrated end domes. Membrane stresses and radial deformations are compared with finite element results for all the three type of domes. Also the theoretical result of stress in the fibre direction of the optimum end dome is compared to that of finite element results.