Design of Filament Wound Composite Pressure Tanks Using Finite Element Analyses

摘要

Filament wound structures such as rocket pressure tanks, pipes and motor cases are widely used in aerospace applications. However, most design and manufacturing of wound structures are based on manufacturing experiences, and there are no established design rules. In this study, finite element analyses using ABAQUS were performed to predict the behavior of filament wound structures considering continuous change in winding angle and thickness at the dome part due to fiber build-up near the metallic boss. In addition, water-pressurizing tests on a motor case were performed to verify the analysis procedure. Strain gages were attached on the surface in the fiber direction. Progressive failure analysis predicted slightly higher burst pressure than the experimental results and the weakest region of the motor case was predicted very well. On the basis of the verified finite element analysis method, pressure tanks were designed with a load sharing metallic liner. Finally, an optimal design model satisfying design requirements was suggested.