Characteristics of Eddy Current Distribution in Carbon Fiber Reinforced Polymer

JIAO Shaoni; LI Jian; DU Fei; SUN Lei; ZENG Zhiwei

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Characteristics of Eddy Current Distribution in Carbon Fiber Reinforced Polymer

JIAO Shaoni,LI Jian,DU Fei,SUN Lei,ZENG Zhiwei * #

School of Aerospace Engineering, Xiamen University, Xiamen 361005

*Correspondence author

#Submitted by

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education （No.20120121110026）, National Science Foundation of China （No.51277154）

Opened online:17 May 2016

Accepted by: none

Citation: JIAO Shaoni,LI Jian,DU Fei.Characteristics of Eddy Current Distribution in Carbon Fiber Reinforced Polymer[OL]. [17 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4688243

The paper studies the characteristics of eddy current (EC) distribution in carbon fiber reinforced polymer (CFRP) laminates so as to guide the research and operation of eddy current testing of CFRP. To this end, an electromagnetic field computation model of EC response to CFRP based on the finite element method is developed. Quantitative analysis of EC distribution in plies of unidirectional CFRP reveals that EC changes slowly along the fiber direction due to the strong electrical anisotropy of the material. Variation of EC in plies of multidirectional CFRP is akin to that in isotropic material because of the EC paths generated by the connections of fibers in adjacent plies with different fiber orientations. The attenuation of EC in the normal direction in unidirectional CFRP is faster than that in isotropic material due to faster diffusion of EC. In multidirectional CFRP, EC increases near the interfaces of plies having different fiber orientations.

Keywords:Carbon fiber reinforced polymer; eddy current testing; skin effect; skin depth

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