Aiming at requirement of characteristics and real-time monitoring of fatigue crack located at the hole of metallic bolted-joint structure

a kind of eddy current array sensor based on flexible plane is proposed. A real-time scheme for fatigue crack propagation monitoring is designed. Semi-analytical model for sensor damage monitoring is constructed

and platform of real-time monitoring on fatigue crack extension based on eddy array sensor is bulit.The characteristic parameters of eddy current sensor array are optimized and the monitoring sensitivity of the sensor is determined through simulation on eddy array sensor and experimental research on fatigue crack extension.Research results indicate th

at the substrate layer impedes the electromagnetic coupling between exciting windings and sensing windings. The thickness of substrate layer should be as thin as possible. While the thickness scope of conductive layer of eddy array sensor is 0. 12

0. 18 mm

the optimal width of exciting coil is 0. 8 mm and that of sensing coil is 0. 5 mm

and the sensitivity of damage monitoring of sensor is the highest.