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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Simulation of Lamb wave propagation for the characterization of complex structures
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Simulation of Lamb wave propagation for the characterization of complex structures

机译：羔羊波传播模拟复杂结构特征

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摘要

Reliable numerical simulation techniques represent a very valuable tool for analysis. For this purpose we investigated the applicability of the local interaction simulation approach (LISA) to the study of the propagation of Lamb waves in complex structures. The LISA allows very fast and flexible simulations, especially in conjunction with parallel processing, and it is particularly useful for complex (heterogeneous, anisotropic, attenuative, and/or nonlinear) media. We present simulations performed on a glass fiber reinforced plate, initially undamaged and then with a hole passing through its thickness (passing-by hole). In order to give a validation of the method, the results are compared with experimental data. Then we analyze the interaction of Lamb waves with notches, delaminations, and complex structures. In the first case the discontinuity due to a notch generates mode conversion, which may be used to predict the defect shape and size. In the case of a single delamination, the most striking "signature" is a time-shift delay, which may be observed in the temporal evolution of the signal recorded by a receiver. We also present some results obtained on a geometrically complex structure. Due to the inherent discontinuities, a wealth of propagation mechanisms are observed, which can be exploited for the purpose of quantitative nondestructive evaluation (NDE).
机译：可靠的数值模拟技术代表了一个非常有价值的分析工具。为此目的，我们调查了本地相互作用模拟方法（LISA）对复杂结构中羊波传播的研究的适用性。 LISA允许非常快速和灵活的模拟，特别是与并联加工结合，并且对于复合物（异质，各向异性，衰减和/或非线性）培养基特别有用。我们在玻璃纤维增​​强板上进行了仿真，最初未脉冲，然后通过其厚度（逐孔）的孔进行。为了验证该方法，将结果与实验数据进行比较。然后我们分析羊波与缺口，分层和复杂结构的相互作用。在第一种情况下，由于凹口引起的不连续性产生模式转换，其可用于预测缺陷形状和尺寸。在单个分层的情况下，最引人注目的“签名”是一个时移延迟，这可以在由接收器记录的信号的时间演变中观察到。我们还提出了在几何复杂结构上获得的一些结果。由于固有的不连续性，观察到大量的传播机制，可以用于定量无损评估（NDE）的目的。

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