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On the anisotropic behavior of electrodes for electrical‐based monitoring of CFRP laminated composites
Author(s) -
Almuhammadi Khaled,
Yudhanto Arief,
Lubineau Gilles
Publication year - 2019
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.24987
Subject(s) - materials science , composite material , electrode , electrical impedance tomography , anisotropy , isotropy , perpendicular , composite number , carbon fiber reinforced polymer , transverse isotropy , electrical impedance , optics , electrical engineering , geometry , chemistry , physics , mathematics , engineering
Electrical impedance tomography (EIT) is a promising structural health monitoring technique for carbon fiber‐reinforced polymer (CFRP) composites. EIT technique has been specifically adopted as a non‐destructive testing method along with the electrical characterization methods. Electrodes are the primary component in any EIT system because they act as an interface connecting the instrument/hardware to the structure under inspection. Simulation of electrical inspection of CFRP usually assumes the electrodes to be electrically isotropic interfaces. We show here that such isotropic assumption is a very poor approximation. We experimentally investigated the electrodes contact impedance behavior on CFRP‐laminated composite specimens for different surface processing (sanding, CO 2 laser, and Yb‐fiber laser). The effective electrical responses of electrodes are characterized in‐depth, so an accurate description can be proposed. Our findings emphasize that the electrodes contact impedance is strongly anisotropic, and varies largely between the on‐axis (along surface fibers) and the off‐axis (bias and perpendicular to the surface fibers) for all tested surface processing. POLYM. COMPOS., 2018. © 2018 Society of Plastics Engineers