Evaluation of acoustic propagation characteristics in fatigue crack nucleation and growth for structural monitoring of aircraft propeller

Due to industrial advances and the application of more dynamic loads, it is necessary to pay more attention to the fatigue issue. Among non-destructive methods, the acoustic emission method has become a standard and reliable method in recent years.With the aim of online structural monitoring of the aircraft propeller that undergoes cracks in the hub part, this article investigates and determines the characteristics of acoustic emission in the growth of aluminum 2025 fatigue crack. Referable research on the loading frequency considered in this research has not been conducted for this alloy. In this project, the characteristics of acoustic emission in the fatigue crack growth of aluminum alloy 2025 for online structural monitoring have been investigated and determined. Acoustic emission tests have been performed in two parts: bending fatigue test with the aim of initiation of fatigue cracks in aluminum alloy 2025 specimens and following tensile tests with the aim of growth of fatigue cracks. According to the received acoustic emission information, various diagrams are plotted. Analyzing the results from online acoustic emission monitoring showed, the acoustic emission method can be considered as a suitable and reliable technique for detecting crack initiation and crack growth in aluminum alloy 2025.