In this paper the 3D numerical stress state analyses of a filament-wound glass-fibre/epoxy-resin tube subjected to internal pressure and tensile loading are considered. The influence of boundary condition estimation including free edge effect are presented. The effects due to the microstructural defects within the reinforced composite material have been considered. The sensitivity of the stress distribution in the tube to the different kinds of damage mechanisms has been studied. The laboratory test configuration was also examined.