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Title
Japanese:電磁誘導非破壊検査を用いたGFRPの吸湿率測定 
English:Measurement of Moisture Absorption of GFRP Using Nondestructive Testing Method Based on Electromagnetic Induction 
Author
Japanese: 松永航, 水上孝一, 水谷義弘, 轟章, 鈴木良郎.  
English: Wataru Matunaga, Mizukami Koichi, yoshihiro mizutani, AKIRA TODOROKI, Yoshirou Suzuki.  
Language Japanese 
Journal/Book name
Japanese: 
English: 
Volume, Number, Page        
Published date 2016 
Publisher
Japanese: 
English: 
Conference name
Japanese:第7回日本複合材料会議 
English:JCCM-7 
Conference site
Japanese:京都 
English:Kyoto 
Abstract In recent years, glass fiber reinforced plastics (GFRPs) have been used as structural materials in tanks due to its potential of weight saving, high strength, cheapness and corrosion resistance. Moisture absorption is one of the causes of the serious accidents since some of them are used for more than 30 years. Moisture absorption is known to decrease compressive, bending and fatigue strength of GFRP structures drastically. Although visual inspection is usually performed to detect moisture absorption, it is difficult to detect internal strength degradation. Therefore, nondestructive testing method based on electromagnetic induction test is newly proposed to measure moisture absorption in this paper. In the previous research, a probe capable of measuring permittivity was developed. In this research, we improved it in order to evaluate change in mechanical properties more easily and developed the testing probe which is able to measure moisture absorption. The testing probe was configured by two pickup coils and one driver coil. In order to cancel mutual induction effect from driver coil, two pickup coils were wound conversely and their differential voltage was measured. Experimental study on woven GFRP showed that absorbing moisture can be measured by using the nondestructive testing method based on electromagnetic induction.

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