Bending behavior of filament-wound fiber-reinforced sandwich pipes

Based on the classical laminated-plate theory, an exact solution is presented for multi-layered filament-wound composite pipes under pure bending. Moreover, detailed stress–strain responses and deflection for filament-wound fiber-reinforced sandwich pipes are investigated using the present analytical method. Sandwich pipes are created using resin material for the core layer and filament-wound composite for the skin layers. It is observed that the axial stress at the inner surface can be larger than that at the outer surface when the pipe has the filament-wound outer layers with high anisotropic materials. The cross-sectional shape of the pipes is no longer a circle even when the pipe is subjected to pure bending load.