航空发动机沉头铆钉断裂故障分析
Fault Analysis on Countersunk Head Rivetinan Aero-Engine

针对试车后发动机反推门沉头铆钉断裂故障，通过对断裂铆钉进行断口宏微观检查、能谱分析、金相检查和力矩试验，结合铆钉的使用情况进行了系统的故障分析，判定该发动机反推门沉头铆钉断裂性质为镉脆断裂。试车中反推门超过正常使用温度，使镉元素渗入铆钉基体，是导致铆钉发生镉脆断裂的原因。结合分析结果为发动机反推门的维修及使用提供建议，以防同类故障再次发生。
Aiming at the fracture of countersunk head rivet of engine back thrust door after the test of aircraft engine operating condition, through macroscopic and microcosmic inspection of fracture, energy spectrum analysis, metallographic inspection and torque test of fractured rivet, combined with the use of rivet system fault analysis, it is determined that the fracture property of countersunk head rivet of engine back thrust door is cadmium brittle fracture. The reason for cadmium brittle fracture of rivet is that the back pushing door exceeds the normal operating temperature in the test of aircraft engine operating condition, which makes cadmium penetrate into the rivet matrix. Combined with the analysis results, the suggestions are provided for the maintenance and use of engine backsliding door to prevent similar failures from happening again.