The effect of autofrattage on stress distribution and fatigue life of composite overwrapped pressure vessels(COPV) was studied by using the numerical simulation. The finite element model of COPV was established based on the commercial software ANSYS. The variations of the thickness and winding angles of the composites along the meridian in the domes section are considered during the modeling. The influence of autofrettage pressure of 54 MPa on the stress of metallic liner and composite layers is analyzed. The fatigue life of the COPV is predicated by using Coffin-Manson formula. The results demonstrated that the diversity between the result of finite element analysis and the experiments
is within 8%,which indicated the finite element model and the analysis is reasonable