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Journal of Sensors
Volume 2016 (2016), Article ID 4292134, 8 pages
http://dx.doi.org/10.1155/2016/4292134
Research Article

Characteristics of Eddy Current Distribution in Carbon Fiber Reinforced Polymer

School of Aerospace Engineering, Xiamen University, Xiamen, Fujian 361005, China

Received 26 May 2016; Revised 22 July 2016; Accepted 31 July 2016

Academic Editor: Yinan Zhang

Copyright © 2016 Shaoni Jiao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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 fast in both directions. 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. The simulation results are beneficial to optimizing sensor design and testing parameters, as well as damage detection and evaluation.