Volume 39, Number 6, December 2021
|Page(s)||1204 - 1211|
|Published online||21 March 2022|
Monitoring cracks of metal structure based on grating thin-film sensor
College of Aeronautic Engineering, Air Force Engineering University, Xi'an 710038, China
2 Unit 95949 of the Chinese People's Liberation Army, Cangzhou 061022, China
The hole edge of a metal structure is the most likely crack position in an aircraft structure. The quantitative monitoring of a hole-edge crack is important for structural health monitoring. Therefore, this paper presented a grating thin-film sensor based on the potentiometric method. Firstly, the anodic oxidation process was used to prepare thin film on 2A12-T4 aluminum alloy matrix to prevent the aluminum alloy matrix from interfering with the monitoring signal of the sensor. Then the DC superimposed pulsed bias arc ion plating technique was used to prepare the grating thin-film sensor on the surface of the specimen. The output characteristics of the grating thin-film sensor are obtained with its finite element model, and the factors affecting the sensitivity of the sensor are analyzed. Finally, the fatigue crack monitoring tests were carried out to verify the quantitative monitoring capability of the grating thin film sensor. The experimental results show that it is feasible for the grating thin-film sensor to quantitatively monitor the fatigue crack at the hole edge of an aircraft metal structure.
Key words: thin-film sensor / aircraft structural health monitoring / crack quantitative monitoring / potentiometric method / arc ion plating technology
关键字 : 薄膜传感器 / 飞机结构健康监测 / 裂纹定量监测 / 电位法 / 电弧离子镀
© 2021 Journal of Northwestern Polytechnical University. All rights reserved.
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