Fatigue crack monitoring of riveted aluminium strap joints by Lamb wave analysis and acoustic emission measurement techniques
Fatigue crack monitoring of riveted aluminium strap joints by Lamb wave analysis and acoustic emission measurement techniques
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DOI：
10.1016/s0963-8695(01)00027-5
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发表时间：
2002-04-01
影响因子：
4.2
通讯作者：
Reithler, L
中科院分区：
文献类型：
--
作者：
Grondel, S;Delebarre, C;Reithler, L
统计表明，疲劳裂纹的发展是航空航天金属结构的首要损伤来源。目前，对这些结构进行检测的方法较为普遍，但这些方法耗时长，成本高，且要求结构系统处于闲置状态。其次，尝试开发损伤检测集成系统对于此类结构的安全性和成本至关重要。本文介绍了使用基于兰姆波的集成系统来评估铝铆接接头在循环加载过程中的完整性的可行性研究。在这个实验分析中，兰姆波是通过耦合在板上的压电换能器在关节区域外被激发和接收的。检测到的损伤是疲劳载荷引起的节点裂纹。利用希尔伯特变换和时频分析对压电换能器上采集到的信号进行了分析。结果表明，兰姆波分析的最终解释可以提供一种确定缺陷大小和跟踪裂纹发展的方法。除此之外，声发射系统与Lamb波分析相结合，以讨论结果和损伤发展。最后，证明了两种方法可以协同工作，得到的结果很吻合。(C) 2002 Elsevier Science Ltd.版权所有。
Statistics show that fatigue crack development comes first and foremost as a damage source in aerospace metallic structures. Currently, widespread methods are available to inspect these structures, but they are quite time-consuming, costly and require the structural system to be idle. Next, attempts to develop damage detection integrated systems are paramount for the safety and cost of such structures. This paper describes an investigation into the feasibility of using an integrated system based on Lamb waves in order to assess the integrity of riveted aluminium, joints during cyclical loading. In this experimental analysis, Lamb waves are excited and received outside the joint area using piezoelectric transducers coupled onto the plates. The detected damage is cracks in joint resulting from fatigue loading. The collected signals on the piezoelectric transducers are analysed using Hilbert transform and time-frequency analysis. It is shown that the final interpretation of Lamb wave analysis may provide a means of sizing the defects and following the crack development. In addition to that, an acoustic emission system is used jointly with the Lamb wave analysis in order to discuss results and damage development. Finally, it is demonstrated that both methods can work together and the results obtained are in good agreement. (C) 2002 Elsevier Science Ltd. All rights reserved.