Characterisation of carbon fibre-reinforced polymer composites through radon-transform analysis of complex eddy-current data
Characterisation of carbon fibre-reinforced polymer composites through radon-transform analysis of complex eddy-current data
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DOI：
10.1016/j.compositesb.2018.05.007
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发表时间：
2018-09-01
影响因子：
13.1
通讯作者：
Smith, R. A.
中科院分区：
文献类型：
--
作者：
Hughes, R. R.;Drinkwater, B. W.;Smith, R. A.
在制造过程中保持碳纤维增强聚合物（CFRP）中正确的纤维方向和堆叠顺序对于实现部件所需的机械性能至关重要。本文提出并评估了一种快速表征CFRP结构中存在的纤维取向的方法，以及不同堆叠顺序的区分，通过对复值涡流检测（ECT）检测数据的Radon变换分析。一个高频（20 MHz）涡流检测系统被用来获得一系列的CFRP样品的不同层堆叠序列的二维扫描。复电阻抗扫描数据进行了分析，使用Radon变换技术，以快速，简单地确定结构中存在的主要纤维取向。这种方法相比，二维快速傅立叶变换（2D-FFT）分析相同的数据，并显示出相对较少的计算步骤和校正，得到上级定量结果。进一步的分析，演示和检查的方法，用于保存复杂的信息内的涡流扫描数据在氡变换分析。这项调查表明，真实的和虚部的ECT数据编码的信息，允许不同的堆叠结构的复合材料之间的区别的麻袋序列。这种新的分析技术可用于CFRP结构的过程分析，作为一种更准确的表征方法，减少了昂贵的制造错误的机会。
Maintaining the correct fibre orientations and stacking sequence in carbon-fibre reinforced polymers (CFRP) during manufacture is essential for achieving the required mechanical properties of a component. This paper presents and evaluates a method for the rapid characterisation of the fibre orientations present in CFRP structures, and the differentiation of different stacking sequences, through the Radon-transform analysis of complex valued eddy-current testing (ECT) inspection data. A high-frequency (20 MHz) eddy-current inspection system was used to obtain 2D scans of a range of CFRP samples of differing ply stacking sequences. The complex electrical impedance scan data was analysed using Radon-transform techniques to quickly and simply determine the dominant fibre orientations present in the structure. This method is compared to 2D-fast Fourier transform (2D-FFT) analysis of the same data and shown to give superior quantitative results with comparatively fewer computational steps and corrections. Further analysis is presented demonstrating and examining a method for preserving the complex information inherent within the eddy-current scan data during Radon-transform analysis. This investigation shows that the real and imaginary components of the ECT data encode information about the sacking sequence allowing the distinction between composites with different stacking structures. This new analysis technique could be used for in-process analysis of CFRP structures as a more accurate characterisation method, reducing the chance of costly manufacturing errors.