Eddy current testing for estimation of anisotropic electrical conductivity of multidirectional carbon fiber reinforced plastic laminates
Eddy current testing for estimation of anisotropic electrical conductivity of multidirectional carbon fiber reinforced plastic laminates
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DOI：
10.1016/j.compositesa.2021.106274
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发表时间：
2021-04
影响因子：
8.7
通讯作者：
K. Mizukami;Yudai Watanabe;K. Ogi
中科院分区：
文献类型：
--
作者：
K. Mizukami;Yudai Watanabe;K. Ogi
本文提出了涡流测试方法来估计多向碳纤维增强塑料的各向异性电导率。采用有限元方法研究了三向电导率对线圈阻抗的影响。利用响应面法将线圈阻抗变化表示为各向异性电导率的近似函数。采用三种方法从测量的线圈阻抗中估计电导率，然后将估计的电导率与使用四探针方法测量的电导率进行比较。利用响应面可以预测电导率的下限和上限，同时考虑到被测材料中电性能的散射。利用所提出的方法准确地预测了电导率范围。在这些估计方法的准确性和简单性之间存在一种权衡关系。
Eddy current testing methods to estimate the anisotropic electrical conductivity of multidirectional carbon fiber reinforced plastics are proposed in this work. Finite element analysis was performed to investigate the contributions of the three-directional conductivities to the coil impedance. The coil impedance variation was expressed as an approximate function with respect to the anisotropic conductivity using the response surface methodology. Three proposed methods were applied to estimate the conductivity from the measured coil impedance and the estimated conductivities were then compared with the conductivities measured using a four-probe method. Use of the response surface enabled prediction of the lower and upper limits of the conductivity while taking the scatter of the electrical properties in the tested material into consideration. The conductivity range was predicted correctly using the proposed methods. There was a trade-off relationship between the accuracy and the simplicity of these estimation methods.