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首页> 外文期刊>International journal of applied electromagnetics and mechanics >Off-axis estimation of lay-up orientation in CFRP laminated composites using eddy current testing
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Off-axis estimation of lay-up orientation in CFRP laminated composites using eddy current testing

机译：使用EDDY电流测试的CFRP层压复合材料中叠层方向的轴截面估计

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摘要

This paper presents a traditional eddy current testing (ET) method to estimate the off-axis of lay-up in the cross-ply and multidirectional carbon fiber reinforced polymer (CFRP) laminates. The transmitter receiver (TR) probe equipped with two identical circular coils was utilized to scan surface of the CFRPs with artificially induced off-axis layers in different depths. A 2D fast Fourier transform (2D-FFT) was applied to the C-scan experimental images for determining the layer orientation. It was observed that several highlighted lines are located at different directions in the Fourier transform images, which correspond to the higher energy and indicate a periodicity in the corresponding direction. From these images, the layer orientation with a minimum -5 degrees off-axis was measured, and the actual fibers direction 40 degrees can be obtained by subtracted 90 degrees from the frequency angle in the Fourier transform image. Additionally, mechanism of the output signal change caused by the off-axis lamina was analyzed using the finite element (FE) analysis. Numerical results showed that deformation of the space magnetic field occurs because of the redistribution eddy current induced in the off-axis lamina, which implies the possibility to measure and estimate the deviated fibers orientation of the CFRPs using the traditional ET method.
机译：本文介绍了传统的涡流试验（ET）方法，以估算交叉层和多向碳纤维增强聚合物（CFRP）层压层中的叠层的轴向轴。配备有两个相同圆形线圈的发射器接收器（TR）探针用于在不同深度中具有人工诱导的偏离轴层的CFRP的表面。将2D快速傅里叶变换（2D-FFT）应用于C扫描实验图像以确定层取向。观察到，几条突出线位于傅里叶变换图像中的不同方向，其对应于更高的能量并指示相应方向上的周期性。根据这些图像，测量具有最小-5度轴轴的层取向，并且可以通过从傅里叶变换图像中的频率角中减去90度来获得实际纤维方向40度。另外，使用有限元（Fe）分析分析由轴轴晶片引起的输出信号变化的机制。数值结果表明，由于在轴轴薄片中引起的再分配涡电流，出现了空间磁场的变形，这意味着使用传统的ET方法可以测量和估计CFRP的偏离纤维取向的可能性。

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