Transactions of Nanjing University of Aeronautics & Astronautics
Crack Quantification of Bolted Joints by Using a Parallelogram Eddy Current Array Sensing Film
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Abstract:
Crack monitoring at the bolt hole edge is one of the important focuses of aircraft structural health monitoring. In this study， a novel eddy current sensing film based on a parallelogram coil array is developed to quantitatively monitor the crack characteristics near the bolt hole with fewer layers and coils， compared with the existing methods. The parallelogram coil array configuration is designed and optimized to improve the quantitative monitoring ability of the crack. A 3×3 parallelogram coil array is used to quantify the crack parameters of aluminum bolted joints. Finite element simulation and experiments show that the proposed parallelogram coil array could not only accurately and quantitatively identify the crack angle at the edge of the bolt hole， but also track the crack length along the radial direction of the bolt hole and the depth along the axial direction.
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This work was supported by the Natural Science Foundation of China （No.11902280）， Aeronautical Science Fund （No.20200033068001）， Innovation Fosundation for Young Scholar of Xiamen （No.3502Z20206042） and the Fundamental Research Funds for the Central Universities （No.20720210049）.
Clc Number:
V240.2
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