Detection and quantitative evaluation of defects in glass fiber reinforced plastic laminates by microwaves

Atsushi Hosoi, Yuhei Yamaguchi, Yang Ju*, Yasumoto Sato, Tsunaji Kitayama

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

A novel method using microwaves is proposed to detect and evaluate defects in glass fiber reinforced plastic (GFRP) laminates. A thin circular plastic film simulating delamination was inserted in GFRP laminates and was detected using microwave reflectometry. A focusing mirror sensor consisting of a horn antenna and two metal mirrors was used to improve the measurement resolution. In addition, the thickness of the film was calculated using a proposed model based on microwave propagation theory. Measuring the variation in the amplitude of the microwave reflectivity, a 7.5-μm-thick film was successfully detected in a 3-mm-thick GFRP laminate. Moreover, the calculated results of the inserted film thickness had a high degree of accuracy.

Original languageEnglish
Pages (from-to)134-144
Number of pages11
JournalComposite Structures
Volume128
DOIs
Publication statusPublished - 2015 Sep 5

Keywords

  • Defects
  • Glass fiber reinforced plastic
  • Microwave
  • Nondestructive evaluation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering

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