Drop damage analysis of automotive high-pressure composite hydrogen storage cylinders

With the world facing an energy crisis today, hydrogen is attracting attention as a renewable and clean energy source. In this paper, a carbon fiber fully wound plastic liner hydrogen storage cylinder (type IV cylinder) was modeled by software. Then the model was subjected to drop simulation, and by changing the drop height, the drop angle and the residual pressure inside the cylinder, the curve and the cloud diagram of the maximum total stress over time as well as the cloud diagram of the positive stress in all directions and the shear stress in all planes of the cylinder were obtained during the drop process. Meanwhile, by comparing the data and images under each working condition, it can be known that the location where the maximum stress appears is always near the spherical end and the pole hole, but the maximum stress is not a single-valued function of the drop height, and it is also related to the drop angle; and the maximum stress as a whole increases with the increase of the residual pressure. At the end of the article, a drop simulation of the conceptual unlined composite highpressure hydrogen storage cylinder (V-cylinder) is also carried out, and it is found that the maximum stress during the drop is basically equal to that of the lined high-pressure hydrogen storage cylinder, and the liner mainly plays the role of preventing leakage and corrosion, and does not bear the stress loads.