Influence of winding pattern on failure of filament wound composite pipe under axial tension

The analytical procedure of filament wound composite pipe under axial tension was built up with finite element analysis (FEA), which adopted micro stiffness model and improved progressing damage method for displaying the influence of filament winding pattern on propagation of damage in filament wound composite and its failure. The axial tensile experiments were performed for three kinds of winding pattern such as one, three and five represent volume element along the circumferential direction of filament wound composite pipe and failure model, average tensile strength and regulation of strength with winding pattern were obtained. The experiments show that the tensile failure of filament wound composite pipe under axial tension is mainly function failure with loss of bearing capacity. Winding pattern has some effect on the tensile strength of filament wound composite. The numerical simulation demonstrates that main damage are matrix crack and fiber/matrix debonding and fiber crossing can result in damage initiation and propagation more easily in the process of axial tension.