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通过对某型航空发动机故障散热器支架进行外观检查、断口分析、表面微观检查、截面金相检查以及材质分析,确定了故障散热器支架断口的高周疲劳属性,明确了表面电加工重熔层中存在的微裂纹、尖锐棱角和结构设计不足造成了应力集中。结果表明:应力集中导致该支架过早发生疲劳断裂,振动载荷也加速了该支架疲劳断裂故障的发生;最后提出了相应的改进建议。
Through the appearance inspection, fracture analysis, surface micro-inspection, cross-section metallographic inspection and material analysis of the radiator support of a certain type of aero-engine, the high-cycle fatigue property of the fracture of the radiator support was determined, and the surface electroforming remelting layer The presence of micro-cracks, sharp edges and structural design caused by stress concentration. The results show that: the stress concentration leads to premature fatigue fracture of the stent, and the vibration load also accelerates the occurrence of fatigue fracture of the stent. Finally, some suggestions for improvement are put forward.