Role of interlaminar interface on bulk conductivity and electrical anisotropy of CFRP laminates measured by eddy current method

Jun Cheng, Hongli Ji, Jinhao Qiu, Toshiyuki Takagi, Tetsuya Uchimoto, Ning Hu

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The purpose of this paper is to deal with the characterization of bulk electrical conductivity in multilayer carbon fiber reinforced polymer (CFRP) laminate by using eddy current method. The correlation between probe signals and conductivities in different directions of unidirectional CFRP is obtained with the aid of numerical code, which is based on finite element method in terms of magnetic vector potential. The effect of interlaminar interface on the bulk conductivity of CFRP laminate is investigated by visualizing the lift-off curves of probe signal in complex plane. It is found out that the cross-ply laminate has much better electrical conductance than unidirectional plate, and the bulk conductivity of CFRP laminate depends mainly on the number of current paths produced by the overlapped fibers at the interfaces between two angled layers. In addition the polar diagrams of T-R probe signals at multiple angular positions are depicted to characterize the anisotropy of CFRP laminate.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalNDT and E International
Volume68
DOIs
Publication statusPublished - 2014 Dec

Keywords

  • Bulk conductivity
  • Carbon fiber reinforced polymer
  • Eddy current testing
  • Electric anisotropy
  • Finite element analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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