Acta Metrologica Sinica  2019, Vol. 40 Issue (6): 952-957    DOI: 10.3969/j.issn.1000-1158.2019.06.03
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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
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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.
Key words： metrology      defect damage      aviation composites      same side multi-electrode array sensor      electrical capacitance tomography      conjugate gradient imaging algorithm     
Received: 03 July 2018      Published: 10 October 2019
PACS:  TB971  
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JI Yan-yong
LIU Ya-nan
DENG Chen-xiao
YAN Chao-qi
CHEN Xi-yuan
Cite this article:   
JI Yan-yong,LIU Ya-nan,DENG Chen-xiao, et al. Research on the Testing of Adhesive Defects of Aeronautical Composites Based on ECT[J]. Acta Metrologica Sinica, 2019, 40(6): 952-957.
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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2019.06.03     OR     http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2019/V40/I6/952
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