Detection of in-plane and out-of-plane fiber waviness in unidirectional carbon fiber reinforced composites using eddy current testing

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• 作者：Koichi Mizukami ; ^{kmizukam@ginza.mes.titech.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Yoshihiro Mizutani ; Akira Todoroki ; Yoshiro Suzuki
• 关键词：D. Non-destructive testing ; A. Carbon fibre ; B. Defects ; C. Finite element analysis (FEA)
• 刊名：Composites Part B: Engineering
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：86
• 期：Complete
• 页码：84-94
• 全文大小：3678 K

文摘

In this paper, we propose a specialized probe to detect in-plane and out-of-plane fiber waviness in unidirectional carbon fiber-reinforced plastics and to characterize fiber orientations by an eddy current-based nondestructive technique. Experimental studies show that the proposed probe can detect in-plane fiber waviness with amplitude of 1.1 mm and length of 15.9 mm in a thin unidirectional carbon fiber reinforced plastic at sufficiently high drive frequency. The validity of the proposed method is verified through three-dimensional finite element method analysis. Variation in amplitude and phase of output signal obtained in numerical analyses qualitatively agreed with experimental results. Out-of-plane fiber waviness induced in a thick unidirectional carbon fiber-reinforced plastic can also be detected using the proposed probe. It is found that output signals in complex plane obtained during scanning a material with out-of-plane waviness become ring-shaped plots. Those plots in complex plane are used to identify the presence and location of out-of-plane fiber waviness.