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Modelling of Lamb waves for damage detection in metallic structures: Part I. Wave propagation

机译：用于检测金属结构中的损伤的兰姆波模型：第一部分。波传播

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摘要

Lamb waves are the most widely used acousto-ultrasonic guided waves for damage detection. The method is generally complicated by the coexistence of at least two highly dispersive modes at any given frequency. Furthermore pure Lamb wave modes may generate a variety of other modes by interacting with defects and/or by crossing different boundaries. Knowledge and understanding of Lamb wave propagation is important for reliable damage detection. However, the theoretical analysis of guided wave scattering forms an extremely difficult problem. This paper reports an application of the local interaction simulation approach for wave propagation in metallic structures. The focus of the analysis is on damage detection applications. The study also involves wave propagation in a piezoceramic actuator/sensor diffusion bond model in which one of the piezoceramics generates the thickness mode vibration. The simulated results are validated experimentally. The results show the potential of the method for wave propagation analysis in damage detection applications.
机译：兰姆波是用于损伤检测的最广泛使用的声-超声波导波。该方法通常由于在任何给定频率下至少两种高度分散模式的共存而变得复杂。此外，纯的兰姆波模式可以通过与缺陷相互作用和/或跨越不同的边界来产生多种其他模式。兰姆波传播的知识和理解对于可靠的损伤检测很重要。然而，导波散射的理论分析形成了一个极其困难的问题。本文报道了局部相互作用模拟方法在金属结构中波传播中的应用。分析的重点是损坏检测应用程序。该研究还涉及压电陶瓷致动器/传感器扩散键模型中的波传播，其中压电陶瓷之一产生厚度模式振动。仿真结果通过实验验证。结果表明该方法在损伤检测应用中进行波传播分析的潜力。

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