Stress and deformation of multiple winding angle hybrid filament-wound thick cylinder under axial loading and internal and external pressure

Multiple winding angle filament-wound (FW) structures may lead to more uniform strength for all filament layers, while there is no analysis method for deformation and stresses calculation of FW cylinder with variation wound angle. Deformation and stresses of a thick cylinder with multi-angle winding hybrid filament under axial loading and internal and external pressure were investigated. The deformation and stresses of each orthotropic unit of fiber layers, as well as longitudinal stress along the fiber direction, transverse stresses perpendicular to the fiber direction and shear stress in fiber layer were obtained analytically. The degenerated case of the model includes single winding angle FW cylinder, FW vessel with a liner, and sandwich pipe with one or multiple core layers. Numeric results of finite element models are present, which are very close to the theoretical results. The research shows that material utilization and working pressure can be increased by multi-angle FW procedure.