Rayleigh to Lamb wave conversion at a delamination-like crack
Rayleigh to Lamb wave conversion at a delamination-like crack
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DOI：
10.1016/j.jsv.2015.05.016
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发表时间：
2015-09
影响因子：
4.7
通讯作者：
C. Schaal;H. Samajder;H. Baid;A. Mal
中科院分区：
文献类型：
--
作者：
C. Schaal;H. Samajder;H. Baid;A. Mal
复合材料结构需要仔细监测，以便在其开发的早期阶段检测和表征隐藏的缺陷，以便在结构失去承载能力并遭受灾难性故障之前采取预防措施。由于波的传播范围大且对其传播路径中的缺陷敏感，超声波导波为检查相对较大的板状结构部件提供了一种有吸引力的工具。由于此类波受到几何结构特征（例如纵梁）以及缺陷（例如分层）的影响，因此导波在实际结构中的应用需要很好地理解它们与上述不连续性的相互作用。本文通过数值模拟和实验室实验对瑞利表面波与厚铝板缺陷的相互作用进行了详细研究。使用简单的铝板来演示和分析相互作用现象的基本特征，这些现象被证明部分导致兰姆波转换。此外，模拟波形与实验获得的波形之间的一致性表明，可以将这些技术应用于更真实的结构及其在损伤检测系统中的使用。
Composite structures require careful monitoring to detect and characterize hidden defects at an early stage of their development so that preventive measures can be taken before the structure loses its load carrying capacity and suffers from catastrophic failure. Ultrasonic guided waves offer an attractive tool for inspecting relatively large plate-like structural components due to the waves׳ large propagation range and sensitivity to defects in their propagation path. Since such waves are affected by geometrical structural features (e.g. stringers) as well as defects (e.g. delaminations), the application of guided waves in real structures requires a good understanding of their interaction with the aforementioned discontinuities. In this paper, a detailed study of the interaction of Rayleigh surface waves with defects in a thick aluminum plate is carried out using numerical simulations and laboratory experiments. The simple aluminum plate is used to demonstrate and analyze the basic characteristics of the interaction phenomena, which are shown to partially result in Lamb wave conversion. Furthermore, the agreement between simulated waveforms and those obtained from experiments are shown, indicating the possibility of applying the techniques to more realistic structures and their use in damage detection systems.