Nondestructive Evaluation of Holed CFRP Laminates by a New Technique to Visualize Propagation of Ultrasonic Waves

Shigeki Yashiro, Junji Takatsubo, Nobuyuki Toyama, Tomonaga Okabe, Nobuo Takeda

Research output: Contribution to journalArticle

Abstract

This study investigated damage detection in holed CFRP laminates by using a newly developed technique for visualizing ultrasonic waves. This technique provided a moving diagram of propagating waves with non-contact scanning by a pulsed laser. Its measurement scheme overcame the difficulties of sensitivity in conventional methods and enabled us to observe ultrasonic waves on CFRP laminates. We observed two types of ultrasonic waves propagating on the CFRP laminate in the measured snapshots. These waves were identified as the <i>S</i><sub>0</sub> and the <i>A</i><sub>0</sub> Lamb modes by the dispersion curves, confirming the validity of the visualization technique for composite laminates. Furthermore, ply cracks and delamination, as well as the damage during manufacturing, were observed near the hole in the loaded specimens, and we successfully visualized the Lamb waves scattered by the delamination. The region of wave scattering agreed with the damage observed by soft X-ray radiography. These inspection results demonstrated the usefulness of the visualization technique in inspecting composite laminates.
Original languageEnglish
Pages (from-to)333-341
Number of pages9
JournalJSMME
Volume2
Issue number3
DOIs
Publication statusPublished - Mar 2008

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carbon fiber reinforced plastics
ultrasonic radiation
laminates
propagation
evaluation
damage
composite materials
Lamb waves
radiography
wave scattering
inspection
pulsed lasers
manufacturing
cracks
diagrams
scanning
sensitivity
curves
x rays

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Nondestructive Evaluation of Holed CFRP Laminates by a New Technique to Visualize Propagation of Ultrasonic Waves. / Yashiro, Shigeki; Takatsubo, Junji; Toyama, Nobuyuki; Okabe, Tomonaga; Takeda, Nobuo.

In: JSMME, Vol. 2, No. 3, 03.2008, p. 333-341.

Research output: Contribution to journalArticle

Yashiro, Shigeki ; Takatsubo, Junji ; Toyama, Nobuyuki ; Okabe, Tomonaga ; Takeda, Nobuo. / Nondestructive Evaluation of Holed CFRP Laminates by a New Technique to Visualize Propagation of Ultrasonic Waves. In: JSMME. 2008 ; Vol. 2, No. 3. pp. 333-341.
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