Enhancement of sensitivity to delamination in eddy current testing of carbon fiber composites by varying probe geometry
Enhancement of sensitivity to delamination in eddy current testing of carbon fiber composites by varying probe geometry
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DOI：
10.1016/j.compstruct.2019.111227
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发表时间：
2019-10-15
影响因子：
6.3
通讯作者：
Heuer, Henning
中科院分区：
文献类型：
--
作者：
Mizukami, Koichi;bin Ibrahim, Ahmad Syukri;Heuer, Henning
提出了一种涡流测试方法来提高碳纤维增强塑料（CFRP）分层的敏感性。使用有限元方法分析研究涡流密度和磁场的分布，以确定分层对电磁场的影响。计算了分层引起的磁场变化，发现通过优化切向驱动器和拾波线圈之间的距离可以显着提高分层灵敏度。对交叉层CFRP样品进行的实验验证了涡流传感器的灵敏度可以得到提高，使得由分层引起的信号变化不会被由CFRP中的电导率变化引起的信号变化所掩盖。使用所提出的涡流方法可以清楚地看到长度和宽度为 10 mm 的嵌入式分层。
An eddy current testing method is proposed to improve the sensitivity to delamination in carbon fiber reinforced plastics (CFRPs). The distributions of the eddy current density and magnetic field are investigated using finite element method analyses to identify the effect of delamination on the electromagnetic field. The change of the magnetic field induced by delamination is calculated and it is found that a distinct improvement of the sensitivity to delamination can be achieved by optimizing the distance between the tangential driver and pickup coils. Experiments performed for cross-ply CFRP samples verify that the sensitivity of the eddy current sensor can be improved such that the signal change caused by delamination is not masked by the signal changes caused by the electrical conductivity variation in CFRP. Embedded delamination with a length and width of 10 mm are clearly visualized using the proposed eddy current method.