Non-contact visualization of fiber waviness distribution in carbon fiber composites using eddy current testing
Non-contact visualization of fiber waviness distribution in carbon fiber composites using eddy current testing
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DOI：
10.1080/09243046.2017.1344917
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发表时间：
2018-01-01
影响因子：
2.9
通讯作者：
Ogi, Keiji
中科院分区：
文献类型：
--
作者：
Mizukami, Koichi;Ogi, Keiji
纤维波纹是碳纤维复合材料在加工过程中产生的缺陷，它会大大降低碳纤维复合材料的抗压强度。在这项研究中，我们开发了涡流技术，使波浪分布的非接触可视化。为了可视化碳纤维复合材料的面内波纹，我们通过测量磁场来可视化沿碳纤维流动的涡流路径。有限元分析表明，涡流磁场的分布可以直观地反映出面内波纹的形状。然而，随着被测材料表面与测量平面之间距离的增加，可视化越来越低估了面内波角。为了避免这种低估，我们提出了一种可以重建地表磁场的磁成像方法。利用远离地表的磁场数据重建地表磁场。在人工诱导面内波纹的交叉层合板上进行了实验。从测量的磁场中可以成功地显示出面内波度的分布。利用这种磁场成像方法实现非接触式测量，波浪形角的测量误差仅为1度。
Fiber waviness is a process-induced defect that greatly decreases the compressive strength of carbon fiber composites. In this study, we developed eddy current techniques that enable non-contact visualization of waviness distribution. To visualize in-plane waviness in a carbon fiber composite, we visualized the path of eddy current flowing along the carbon fiber by measuring the magnetic field. Finite element analyses show that the shape of the in-plane waviness can be visualized in the distribution of the magnetic field from the eddy current. However, with increasing distance between the surface of the tested material and measurement plane, the visualization increasingly underestimates the in-plane waviness angle. To avoid this underestimation, we propose a magnetic imaging method that can reconstruct the magnetic field at the surface. The surface magnetic field was reconstructed by using the magnetic field data measured away from the surface. Experiments were performed on a cross-ply laminate with artificially induced in-plane waviness. The distribution of in-plane waviness can be successfully visualized from the measured magnetic field. Using this magnetic field imaging method to enable non-contact measurements, the angle of waviness can be measured with an error of only 1 degrees.