Abstract: The investigation on axially residual deformation of filament wound pressure vessels has a great significance for improving the dimensional stability of the produced vessels and satisfying the pressure vessel certification. In this paper, the influence of the material properties of the titanium liner on the residual deformation of the isotensoid pressure vessel was evaluated. The accurate modeling method was used to create the cylindrical and dome sections for a helically and hoop overwound pressure vessel. The stress-strain curves of the titanium liners with various yield strength values were experimentally obtained and then substituted into the created finite element model. The axially residual deformation of the pressure vessels corresponding to various liner strengths was calculated. The results show that the filament wound pressure vessel became short in the axial direction after the given loading/unloading procedure. The change in the yield strength of the titanium liner has a remarkable effect on the axially residual deformation of filament wound pressure vessels.

Key words: composite materials, filament winding, pressure vessel, yield strength, residual deformation