Detection of in-plane and out-of-plane fiber waviness in unidirectional carbon fiber reinforced composites using eddy current testing. (1st February 2016)

• Record Type: Journal Article
• Authors: Mizukami, Koichi; Mizutani, Yoshihiro; Todoroki, Akira; Suzuki, Yoshiro
• Is Part Of: Composites. Volume 86(2016)
• Page Start: 84
• Page End: 94
• Publication Date: 2016-02-01
• Subjects: D. Non-destructive testing -- A. Carbon fibre -- B. Defects -- C. Finite element analysis (FEA); Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2015.09.041
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: 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.