Applicability of eddy current testing in CFRP using electrodes on CFRP surface and control of the testing range
Applicability of eddy current testing in CFRP using electrodes on CFRP surface and control of the testing range
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DOI：
10.1080/09243046.2022.2035303
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发表时间：
2022-02
影响因子：
2.9
通讯作者：
Wataru Matsunaga;K. Mizukami;Y. Mizutani;A. Todoroki
中科院分区：
文献类型：
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作者：
Wataru Matsunaga;K. Mizukami;Y. Mizutani;A. Todoroki
为了方便单向碳纤维增强塑料（UD-CFRP）的检测，控制检测范围，提出了一种新的涡流检测方法。首先，分析了电极与纤维方向正交对单向碳纤维复合材料的影响。结果表明，添加电极可以显著提高涡流密度。此外，还发现通过调节电极间距可以控制涡流密度在深度轴上的分布。接下来，对准各向同性CFRP进行相同的分析以进行比较。结果表明，与UD-CFRP的结果不同，不能通过调节电极的距离来控制深度方向上的分布。最后，测量了带有电极的UD-CFRP的阻抗，以确认添加电极有助于ECT。同时也证实了阻抗随电极间距的增大而增大，这一趋势与数值模拟结果一致。
In this study, a novel eddy current testing (ECT) method was developed to facilitate the testing of unidirectional carbon fiber reinforced plastic (UD-CFRP) and control the detection range. First, the effect of adding electrodes orthogonal to the fibers of UD-CFRP were analyzed. The results showed that the eddy current density could be significantly increased by adding electrodes. Moreover, it was found that the distribution of eddy current density in depth axis can be controlled by adjusting the distance of electrodes. Next, the same analysis was conducted for quasi-isotropic CFRP for comparison. The results showed that, unlike the results for the UD-CFRP, the distribution in depth direction could not be controlled by adjusting the distance of the electrodes. Finally, the impedance of the UD-CFRP with electrodes was measured, for confirming that adding electrodes facilitated ECT. It was also confirmed that the impedance increased as the distance between electrodes increased, and this trend was consistent with the numerical simulation results.