针对某航空弹性鼠笼断裂问题，建立该型弹性鼠笼结构有限元模型，研究弹性鼠笼结构在涡动激励、径向载荷与轴向载荷条件下的应力响应，开展疲劳故障机理分析以及试验研究。结果表明，鼠笼断裂的根源在于肋条末端圆弧过渡段为交变应力超过了材料在线切割加工条件下疲劳极限，由高幅振动疲劳引起破坏；弹性鼠笼在复杂受载情况下，涡动激励对其疲劳破坏占主导作用，径向与轴向载荷为次要影响；线切割加工产生的重熔层严重影响鼠笼疲劳极限，在高强度鼠笼加工中应避免采用该加工形式。

Aiming at the fracture problem of an aero elastic squirrel cage, the finite element model of the elastic squirrel cage structure was established, and the stress response of the elastic squirrel cage structure under the conditions of whirl excitation, radial load and axial load was studied, and the fatigue fault mechanism analysis and experimental study were carried out. The results show that the root cause of cage fracture is that the alternating stress of the arc transition section at the end of the rib exceeds the fatigue limit of the material under the condition of online cutting, and results in the damage by high-amplitude vibration fatigue. Under complex loading conditions, whirl excitation dominates fatigue failure of elastic squirrel cage, while radial and axial loads are a secondary effect. The remelting layer produced by wire-cutting seriously affects the fatigue limit of cage, so it should be avoided in high-strength cage processing.