Detection of delamination in laminated CFRP composites using eddy current testing: Simulation and experimental study

Xiaojuan Xu, Hongli Ji, Jinhao Qiu, Toshiyuki Takagi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The applicability of conventional eddy current (EC) testing to detect delamination in laminates of carbon fiber reinforced polymers (CFRP) was assessed. As delamination impedes the induced currents flowing across the layers, the EC technique offers the potential for delamination in CFRPs to be detected by sensing the change in probe output signals caused by distortions in the magnetic field. In a numerical study, ECs distribution in CFRPs alters considerably in multidirectional and cross-ply laminates and currents drop steeply when delamination is present. In experiments, the detectability of delamination at different depths was investigated using 24-layer laminates, each with different stacking sequences. The change in amplitude of the probe output signal obtained from data agrees qualitatively with the numerical analysis. The size and location of the delamination defect were compared with those obtained in ultrasonic scanning images. Experiments show that delamination at a maximum depth of 0.75 mm in cross-ply samples could be detected, whereas subsurface defects in the unidirectional plate went undetected.

Original languageEnglish
Pages (from-to)177-192
Number of pages16
JournalInternational Journal of Applied Electromagnetics and Mechanics
Volume57
Issue number2
DOIs
Publication statusPublished - 2018

Keywords

  • Conventional eddy current testing
  • carbon fiber reinforced polymer
  • delamination detection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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