Delamination detection in composites through guided wave field image processing
Delamination detection in composites through guided wave field image processing
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DOI：
10.1016/j.compscitech.2011.04.011
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发表时间：
2011-06-15
影响因子：
9.1
通讯作者：
Swenson, E.
中科院分区：
文献类型：
--
作者：
Sohn, H.;Dutta, D.;Swenson, E.
本研究探讨了使用非接触式导波成像系统检测多层复合材料中隐藏分层的可行性。该研究分两个阶段进行。在第一阶段，兰姆波由安装在复合板表面上的铅 (Pb) 锆钛酸盐传感器 (PZT) 激发，并使用一维 (1D) 扫描激光多普勒振动计 (LDV) 测量面外速度场。根据扫描的时间信号，构建并处理波场图像，以研究兰姆波与分层的相互作用。本文介绍了用于突出扫描区域缺陷的附加信号和图像处理技术。该技术使用从 1.8 毫米厚的多层复合材料收集的实验数据进行了演示。在第二阶段，描述了完全非接触式系统来激发和测量导波。调制连续波 (CW) 激光源与光电二极管结合使用，以无线方式激励连接的 PZT，并使用测振仪再次感测产生的波。该非接触系统用于激发和测量复合通道测试物品中的弹性波。弹性波传播图像序列是由非接触激励系统创建的。 (C) 2011 Elsevier Ltd. 保留所有权利。
This study explores the feasibility of using a non-contact guided wave imaging system to detect hidden delamination in multi-layer composites. The study is conducted in two phases. In the first phase, Lamb waves are excited by a lead (Pb) Zirconate Titanate transducer (PZT) mounted on the surface of a composite plate, and the out-of-plane velocity field is measured using a one-dimensional (1D) scanning laser Doppler vibrometer (LDV). From the scanned time signals, wavefield images are constructed and processed to study the interaction of Lamb waves with delamination. The paper presents additional signal and image processing techniques used to highlight the defect in the scanned area. The techniques are demonstrated using experimental data collected from a 1.8 mm thick multi-layer composite. In the second phase, a completely non-contact system is described to excite and measure guided waves. A modulated continuous wave (CW) laser source in conjunction with a photodiode is used to wirelessly excite an attached PZT and the resulting waves are again sensed using the vibrometer. The non-contact system is used to excite and measure elastic waves in a composite channel test article. The elastic wave propagation image sequences are created from the non-contact excitation system. (C) 2011 Elsevier Ltd. All rights reserved.