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Title
Japanese: 
English:Qualitative evaluation of the moisture absorption rate in adhesive layers of carbon fiber reinforced plastic joints using electromagnetic induction testing 
Author
Japanese: 松永 航, 今井 理, 水谷 義弘, 安岡 哲夫, 轟 章.  
English: Wataru Matsunaga, Satoshi Imai, Yoshihiro Mizutani, Tetsuo Yasuoka, Akira Todoroki.  
Language English 
Journal/Book name
Japanese: 
English:Composite Structures 
Volume, Number, Page Vol. Volume 323    No. 1   
Published date Nov. 1, 2023 
Publisher
Japanese: 
English:Elsevier 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.sciencedirect.com/science/article/pii/S0263822323008139?dgcid=coauthor
 
Abstract Herein, we developed and tested a method for moisture absorption rate measurements in the adhesive layers of carbon fiber reinforced plastic (CFRP) joints using electromagnetic induction testing (EIT). The proposed method relied on permittivity changes in the adhesive layer resulting from moisture absorption, which were evaluated by EIT. Moreover, the effects of changes in the thickness, conductivity, and permittivity of the CFRP and adhesive layer on the EIT output were evaluated by finite element analysis. Moisture absorption tests were conducted on the adhesive, CFRP, and CFRP single-lap joints, and a method was developed to record the permittivity changes in the adhesive layer of the CFRP joint, considering the influencing factors. The proposed method was found to be capable of qualitatively evaluating the moisture absorption rate in the adhesive layer of a CFRP joint from the central to the late moisture absorption period.

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