Eddy-current array-probe technique for imaging near-surface and deep-lying delaminations in multidirectional carbon fiber composites
Eddy-current array-probe technique for imaging near-surface and deep-lying delaminations in multidirectional carbon fiber composites
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DOI：
10.1016/j.compstruct.2021.114537
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发表时间：
2021-11
影响因子：
6.3
通讯作者：
K. Mizukami;Shuya Hioki;Keisuke Moriyama;K. Ogi;Wataru Miyaji;Kenshi Kimura
中科院分区：
文献类型：
--
作者：
K. Mizukami;Shuya Hioki;Keisuke Moriyama;K. Ogi;Wataru Miyaji;Kenshi Kimura
提出了一种涡流阵列探针法，用于观察多向碳纤维增强塑料的分层现象。首先，通过包括单个驱动线圈和多个拾取线圈的线圈阵列探头扫描具有近表面分层的样品，并且通过信噪比评估分层的可检测性。适当地选择图像相位和驱动线圈与拾取线圈之间的距离使得能够检测分层，从而抑制非缺陷区域中的信号变化。此外，实验结果表明，驱动线圈和最敏感的拾取线圈之间的距离与分层的大小相关。其次，阵列探针技术被用来检测位于不同深度的分层。分层的可检测性被发现是强烈的阵列探头的旋转角度的影响。最佳探头旋转角度取决于分层的深度，这表明通过设置适当的探头旋转角度可以可视化发生在较深区域的分层。
An eddy-current array-probe method was proposed to visualize delamination occurring within multidirectional carbon fiber-reinforced plastics. First, samples with a near-surface delamination were scanned by a coil array probe comprising a single driver coil and multiple pickup coils, and the detectability of the delamination was evaluated by the signal-to-noise ratio. An appropriate selection of the image phase and the distance between the driver and pickup coils enabled detection of the delamination suppressing the signal variation in the non-defective region. Furthermore, the experimental results suggested that the distance between the driver coil and the most sensitive pickup coil correlated with the delamination size. Second, the array-probe technique was used to detect a delamination located at various depths. The detectability of the delamination was found to be strongly affected by the rotation angle of the array probe. The optimum probe rotation angle depended on the depth of the delamination, indicating that a delamination occurring in deeper regions can be visualized by setting an appropriate probe rotation angle.