Capacitive imaging of impact damage in composite material
Capacitive imaging of impact damage in composite material
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DOI：
10.1016/j.compositesb.2017.01.016
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发表时间：
2017-03-15
影响因子：
13.1
通讯作者：
Pierce, S. G.
中科院分区：
文献类型：
--
作者：
Morozov, Maxim;Jackson, William;Pierce, S. G.
本文介绍了利用共面电容传感器对机织纤维碳纤维复合材料冲击损伤的电容式无损成像。该方法的创新之处在于，首次利用电容式传感器对CFRP特性的响应的光谱特性来建立激励频率，以实现分层的最佳成像。对于被测样品，最佳激发频率为200 MHz以上。在每个样品上都获得了清晰的分层电容图。使用相控阵技术获取撞击引起的分层的超声(UT)C扫描，以确认分层的存在和程度。电容成像技术可以作为UT的补充，用于在UT没有足够的时域分辨率的情况下对复合材料中的浅层缺陷进行成像。(C)2017爱思唯尔有限公司。保留所有权利。
This work presents capacitive non-destructive imaging of impact damage in woven fibre CFRP using a coplanar capacitive sensor. Novelty of the approach consists in that spectral characteristics of the capacitive sensor response to CFRP properties are firstly used to establish excitation frequencies for optimum imaging of delamination. For the tested samples optimum excitation frequencies were found to be above 200 MHz. Clear capacitive images of delaminations were obtained on each sample. Ultrasonic (UT) C-scans of delaminations due to impacts were acquired using phased array technique to confirm presence and extent of the delaminations. Capacitive imaging technique can be used as complementary to UT for imaging shallow defects in composite materials at depths where UT has insufficient time domain resolution. (C) 2017 Elsevier Ltd. All rights reserved.