Efficient detection of delamination in multilayered structures using ultrasonic guided wave EMATs
Efficient detection of delamination in multilayered structures using ultrasonic guided wave EMATs
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DOI：
10.1016/j.ndteint.2010.03.004
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发表时间：
2010-06-01
影响因子：
4.2
通讯作者：
Lopez, Borja
中科院分区：
文献类型：
--
作者：
Gao, Huidong;Ali, Syed;Lopez, Borja
本文提出了一种利用超声导波和电磁超声换能器（EMAT）相结合的方法来检测分层的有效方法。本文所研究的检测材料是一种黄铜/铜/黄铜三层金属复合材料的硬币坯。在实验中我们首次观察到了波对分层宽度的敏感性的循环行为。然后，通过有限元模拟证实了这一观察结果。研究发现，分层后两个子系统中的转换波模式的相速度与循环行为有关。为了补偿循环行为，在工业检测系统中使用两种波模式，以确保有效检测复合材料样品中的分层。该电磁超声检测系统的检测速度为1.8 m（2）/s。(C)2010爱思唯尔有限公司保留所有权利。
This paper presents an efficient method for the detection of delamination using a combined technology of ultrasonic guided wave and electromagnetic acoustic transducer (EMAT). The material for inspection studied in this paper is a three-layered brass/copper/brass metal composite for coin stocks. We first observed a cyclic behavior of wave sensitivity to delamination width in the experiment. This observation is then confirmed with finite element simulation. We found out that the cyclic behavior is related to the phase velocity of the converted wave modes in the two subsystems after delamination. To compensate for the cyclic behavior, two wave modes are used in an industrial inspection system to ensure effective detection of delamination in the composite sample. The inspection speed achieved with this EMAT inspection system is 1.8 m(2)/s. (C) 2010 Elsevier Ltd. All rights reserved.