Abstract: Compared with the traditional shell element modeling and analysis methods for resin based fiber winding composite pressure vessels, this paper proposes a modeling and finite element analysis method for dry filament wound pressure vessels based on the fiber bundle model. The parametric modeling of the dry fiber winding layer was accomplished through Python programming and MATLAB. The finite element software ABAQUS was used to study the mechanical response of the dry fiber wound pressure vessel under working pressure. Using a robot winding station to complete the dry yarn winding experiment of the pressure vessel, the feasibility of design parameters and line type was verified. The calculation results show that the parametric modeling method based on dry yarn bundles can accurately reflect the true path of filament winding. The continuous layering scheme at the same angle makes the mechanical properties of the fiber more fully utilized. Under the working pressure (i. e.,4 MPa), the stress values in each zone of the cylinder are all designed to meet the design requirements, the maximum principal stress of the fiber in the loop layer of the cylinder body is much greater than that of the spiral layer. When the internal pressure reaches 16 MPa, fiber breakage in the circumferential direction causes the failure of pressure vessel.

Key words: dry fiber winding, pressure vessel, parametric modeling, embedded element technique, strength analysis