Visualization and size estimation of fiber waviness in multidirectional CFRP laminates using eddy current imaging
Visualization and size estimation of fiber waviness in multidirectional CFRP laminates using eddy current imaging
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DOI：
10.1016/j.compositesa.2016.07.008
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发表时间：
2016-11-01
影响因子：
8.7
通讯作者：
Nakamura, Yoshiaki
中科院分区：
文献类型：
--
作者：
Mizukami, Koichi;Mizutani, Yoshihiro;Nakamura, Yoshiaki
本文提出了一种涡流法显示多向碳纤维增强塑料中纤维波纹度的方法。由于由驱动线圈感应的涡电流沿着碳纤维流动，因此如果涡电流路径被可视化，则波度可以被可视化。本文提出了一种新的复平面分析方法来从磁场测量中可视化涡流路径。有限元分析结果验证了该方法的有效性。对多向碳纤维增强塑料试件进行了试验研究。在试样中人为地诱导具有6.9度到24.9度的失准角的面内波纹。涡流路径从磁场数据可视化，它对应于感应波纹的形状。波浪形涡流路径的尺寸与通过X射线计算机断层扫描和从光学图像测量的波纹尺寸进行了比较。实验结果表明，该方法可以准确地估计出表面波纹度的大小，而低估了次表面波纹度的大小。(C)2016爱思唯尔有限公司版权所有
This paper presents an eddy current method to visualize fiber waviness in multidirectional carbon fiber reinforced plastics. Since eddy currents induced by a driver coil flow along carbon fibers, waviness can be visualized if the eddy current path is visualized. We proposed a new complex plane analysis method to visualize an eddy current path from magnetic field measurements. The validity of the method was verified by finite element method analyses. Experiments were performed for multidirectional carbon fiber reinforced plastic specimens. In-plane waviness with misalignment angle from 6.9 degrees to 24.9 degrees were artificially induced in the specimens. An eddy current path was visualized from magnetic field data and it corresponded to the shape of induced waviness. The sizes of the wavy eddy current path were compared with waviness sizes measured by X-ray computed tomography and from optical images. Experimental results indicate that the surface waviness size can be estimated accurately, whereas the subsurface waviness size is underestimated. (C) 2016 Elsevier Ltd. All rights reserved.