Fatigue life calculation method for cryo-compressed hydrogen storage vessel

As hydrogen plays increasingly vital role in the future energy network, storage, one of the essential processes, has attained much attraction. It is necessary to develop efficient methods to assist in designing, manufacturing and evaluating hydrogen storage vessels for different application scenarios and standards. In this work, the theoretical calculation of fatigue life for cryo-compressed hydrogen (CcH2) storage vessel have been detailed studied. Firstly, the temperature and pressure variation on the vessel liner were calculated under the refueling and discharging cycle. Subsequently, the stress cycling of the fragile winding layer was transformed by elastic-plastic mechanics method. Furthermore, the S-N curve method and residual strength/stiffness theory were used to calculate the fatigue of the winding layer and optimize the fatigue life, respectively. Finally, the rationality of the calculated fatigue life was verified by the comparison with existing research. The results shows that the fatigue life of CcH2 storage vessel under cryogenic temperature will be smaller than under normal temperature. The optimized calculation of fatigue causes a certain change in the actual fatigue life, which can reach 1% compared to not correcting the fatigue life. The main failure form is transverse fracture of composite materials caused by compression.