Delamination Detection in Holed CFRP Laminates Using Visualized Ultrasound Propagation

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  • YASHIRO Shigeki
    Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST)
  • TAKATSUBO Junji
    Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST)
  • TOYAMA Nobuyuki
    Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST)
  • OKABE Tomonaga
    東北大学大学院工学研究科
  • TAKEDA Nobuo
    東京大学大学院新領域創成科学研究科

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  • 超音波伝ぱの可視化による有孔ＣＦＲＰ積層板中の層間はく離検出
  • チョウオンパデンパ ノ カシカ ニ ヨル ユウコウ CFRP セキソウバン チュウ ノ ソウ カン ハクリ ケンシュツ

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Abstract

This study applied a newly developed technique for visualizing ultrasonic waves to damage detection in holed CFRP laminates. This technique provided a moving diagram of propagating waves with the use of a pulsed laser for generation scanning a specimen and a fixed transducer for reception. Multiple types of damage (i.e. splits, transverse cracks and delamination), as well as delamination during processing, were observed near the hole in the loaded specimens by soft X-ray radiography. The specimens were then inspected by visualizing the propagation of ultrasonic waves. The S0 and A0 Lamb modes were visualized on the CFRP cross-ply laminate. Furthermore, we successfully detected delamination near the hole through the appearance of scattered waves. These inspection results agreed well with that by soft X-ray radiography, and consequently confirmed the usefulness of the technique for visualizing ultrasonic waves in inspection for composite laminates.

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