Abstract: It is of great significance to carry out research on the trend of axial residual deformation of composite material pressure vessels as well as revealing the influence mechanism and the reasonable on axial residual deformation of pressure vessels, which is helpful to control dimensional stability of composite pressure vessel in service. In this paper, the important part is to have finite element analysis and experimental research on the axial residual deformation of composite material pressure vessels since the process of autofrettage. The results show that the plastic deformation occurrs in the titanium liner under work pressure. In order to ensure the head curve of continuous coordination in the progress of autofrettage, the head liner inward concave and pressure vessels have the trend of axial shortening deformation. In addition, the change of yield strength of titanium liner has obvious effects on the trend of the axial residual deformation of pressure vessel. With the increase of titanium liner material yield strength, axial residual deformation of composite pressure vessel (shorten) decreases, and the better consistency between finite element analysis with experimental prediction results has been proven.

Key words: composite materials, filament winding, pressure vessel, axially residual deformation, autofrettage