Research on the Testing of Adhesive Defects of Aeronautical Composites Based on ECT
JI Yan-yong1,LIU Ya-nan1,DENG Chen-xiao1,YAN Chao-qi1,CHEN Xi-yuan2
1. College of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China
2. Civil Aircraft Airworthiness and Maintenance Key Lab of Tianjin, Civil Aviation University of China, Tianjin 300300, China
Abstract：To solve the problem of defects during the process of production and service of aviation composite materials, a nondestructive testing method based on capacitance sensing principle that consists of a same side multi-electrode array sensor was proposed. Based on the edge effect of capacitance, a set of identical electrode array system was designed to detect the adhesive defects, the true distribution of defects in aerospace composites was simulated. The electrical capacitance tomography system worked in single electrode excitation mode, and according to the change of capacitance value caused by the change of dielectric properties of defects, the system used the conjugate gradient algorithm to detect the location and shape of the defects. The experimental results showed that the mentioned method can accurately determine the location and size of the defects, and detect the defects of 8mm adhesive structure inside the carbon fiber composite with 2mm thickness, and the images of ECT detection system were clear with less edge artifacts. The method provided a new research direction for the development of the detection of defects in composite materials.
季厌庸,刘亚楠,邓晨肖,闫超奇,陈希远. 基于ECT的航空复合材料缺陷检测研究[J]. 计量学报, 2019, 40(6): 952-957.
JI Yan-yong,LIU Ya-nan,DENG Chen-xiao,YAN Chao-qi,CHEN Xi-yuan. Research on the Testing of Adhesive Defects of Aeronautical Composites Based on ECT. Acta Metrologica Sinica, 2019, 40(6): 952-957.
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2019, Vol. 40 
