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Development of a structural design methodology for filament winding composite rocket motor case

Erturan, Yakup
Filament winding pressure vessels have a unique place in many areas such as space and ground applications for decades. Filament winding pressure vessels are used in products where weight is very critical. In such applications, composite winding pressure vessels have significant advantages over metal pressure vessels due to their high specific strength. In this study, it is aimed to design and analyze composite rocket motor cases produced by the filament winding method. Within the scope of the study, the dome profile, filament winding angle and strength of the filament winding composite case are calculated. Two methods are used in the design of dome of the filament winding pressure bearing containers. One of them gives a geodesic dome profile while the other is designed with a non-geodesic dome. Since geodesic winding dome design method limits the design parameters and boundary conditions, non-geodesic winding method, which provides wider design space, is used in this study. The fibers must remain stable on the winding mandrel during production and the slip tendency should also be taken into account in the design of the dome profile. Therefore, it is necessary to emphasize the importance of finding a suitable winding pattern by considering both the production and design criteria. 2-D analyses are performed in ABAQUS program in order to understand the design method better and to see how the case behaves when subjected to an internal pressure loading.