Failure analysis of runway centerline light and effect of microstructure on mechanical properties

Material failure of runway centerline lights was observed in Beijing Capital International Airport after a period of service. In the present paper, visual inspection indicated that cracks initiated from the threaded surface of the lamp, and propagated until fracture. The mechanical properties of three typical lamps were evaluated by tensile, fatigue and impact tests. Microstructural features were also observed. The effects of microstructure and chemical composition on the mechanical properties were identified. It is indicated that improving the material properties of runway centerline lights is beneficial for extending service life and avoiding similar failures.