Crack Quantification of Bolted Joints by Using a Parallelogram Eddy Current Array Sensing Film  

基于平行四边形涡流阵列传感薄膜的螺栓连接结构裂纹定量监测技术研究

作　　者：SUN Hu ZHANG Yiming YI Junyan WANG Yishou QING Xinlin 孙虎;张义明;伊君艳;王奕首;卿新林(厦门大学航空航天学院,厦门361102)

机构地区：[1]School of Aerospace Engineering,Xiamen University,Xiamen 361102,P.R.China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2022年第1期98-107,共10页南京航空航天大学学报（英文版）

基　　金：supported by the Natural Science Foundation of China(No.11902280);Aeronautical Science Fund(No.20200033068001);Innovation Fosundation for Young Scholar of Xiamen(No.3502Z20206042);the Fundamental Research Funds for the Central Universities(No.20720210049)。

摘　　要：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.螺栓孔边裂纹监测是飞机结构健康监测的重要内容之一。本文提出了一种基于平行四边形线圈阵列的新型涡流传感薄膜,与现有方法相比,可以在更少的传感层和线圈数量定量监测螺栓孔边的裂纹参数。本文设计并优化了平行四边形线圈阵列的构型,采用3×3平行四边形线圈阵列定量监测螺栓孔边裂纹参数,可以有效提升裂纹定量监测能力。有限元仿真和实验验证了本文所提出的平行四边形线圈阵列不仅可以准确、定量地识别螺栓孔边裂纹的角度,还可以跟踪裂纹沿螺栓孔径向的长度和沿轴向的深度。

关 键 词：bolted joints flexible eddy current sensing film parallelogram coil array structural health monitoring 

分 类 号：V240.2[航空宇航科学与技术—飞行器设计]