Low cycle fatigue test of rotating disc under axial loading

In order to meet the outfield service requirement of the engine assembled in a aircraft, the research was conducted on low cycle fatigue test of aero-engine disc based on traditional safety life method. The stress state of disc under engine working conditions was calculated using finite element method, while the critical positions and the corresponding standard cycle were confirmed with failure analysis. According to the feature that the disc's stress state was affected by axial loading, the test parameters were confirmed through analogy, and the test rig was designed to apply axial loading to the disc under rotating condition. The research shows: the critical position of the disc is not only related to stress level, but also depends on structure and failure mode. Test design needs to consider the impact on the stress state by axial loading. By adjusting the amount of oil, the test rig can control the axial loading and meet the requirement of various tests with different parameters for the new disc and the used one after outfield service.