Damage detection using Lamb waves is based on guided ultrasonic waves introduced to a structure at one point and sensed at different location. Damage in a structure is identified by a change in the output signal. Previous studies show that even simple excitation signals can lead to complex response signals. Therefore knowledge and understanding of wave propagation can ease the interpretation of damage detection results. There exist various modelling techniques for acousto-ultrasonic wave propagation. The paper reports an application of the local interaction approach. The focus of the analysis is on two-dimensional wave interactions with defects in metallic structures. The method shows the potential for complex modelling of acousto-ultrasonic waves in damage detection applications.
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