Abstract: Taking the composite energy storage flywheel as the research object, this paper analyzed the influence of the material layout on the flywheel stress. Aiming at the structural characteristics of the flywheel, a stress analysis model of a multi-layer interference fit composite material rim was established, and the radial and hoop stress distribution of composite material flywheel under different material placement sequence was analyzed by ANSYS Workbench software. The results show that when the rim material is the same in all layers, the stress of using glass fiber is the largest, and the stress of using carbon fiber T800 is the least, which the rotating speed is constant. When the rim material of each layer is different, the inner layer is a lower cost glass fiber, the middle layer is a carbon fiber T300, and the outer layer is a higher cost carbon fiber T800, so that the force of the flywheel is the most uniform and the stress gradient is the smallest. The research results will have certain reference value for the design and optimization of composite energy storage flywheels.

Key words: composite materials, energy storage flywheel, material layout sequence, stress, ANSYS Workbench