4.7 Article

Interlaminar contact resistivity and its influence on eddy currents in carbon fiber reinforced polymer laminates

Journal

NDT & E INTERNATIONAL
Volume 94, Issue -, Pages 79-91

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2017.12.003

Keywords

Contact resistivity; CFRP; Eddy current; Electrodes size

Funding

  1. Major State Basic Research Development Program of China (973 Program) [2015CB057501]
  2. Fundamental Research Funds of the Central Universities [NP2016201]
  3. State Key Laboratory of Mechanics and Control of Mechanical Structures [0515Y02, NE2015101]
  4. 333 project of Jiangsu Province [BRA2015310]
  5. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

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In this study, contact resistivity of interlaminar interface and its influence on eddy currents in carbon fiber reinforced polymer (CFRP) laminates were thoroughly investigated. Measurements of the contact resistivity between the adjacent laminae were conducted experimentally, together with the anisotropic bulk conductivity of a single-layer lamina. The measured values were then used in finite element (FE) models to study the influence of the contact resistivity on eddy currents in CFRP laminates. It was found that eddy currents are highly concentrated around the laminae interfaces when contact resistivity is taken into account, while the currents experience a steep drop in a non-contact model. The FE results were verified by comparing the calculated voltages with the experimentally measured ones. In addition, effects of electrodes size on the electric potential in CFRP were numerically analyzed. It was observed that electric potential diffuses due to the electrical anisotropy in CFRP, and thus the visible electrodes area is not the effective one.

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