Numerical study on the influence of liner geometry and lay-up sequence on the fatigue life of composite hydrogen storage vessel

This study focuses on the effect of liner geometry and lay-up sequence on the fatigue life of composite hydrogen storage vessel (CHSV). The ellipsoidal ratio and the maximum thickness of boundary section are selected as the independent variables for liner geometry and a sequence is determined that can make the vessel have higher fatigue life from 12 different lay-up schemes. The difference of the stress condition of the liner is the decisive factor that leads to the change of the fatigue life of CHSV, and this paper summarizes the influence law of the von Mises stress of liner on the lifetime of the vessel. The results show that stress concentrations in the dome section and excessive amplitude of alternating stress in the cylinder section should be avoided. Finally, a reasonable combination of parameters is determined, which can be a reference for the design of type III CHSV.