Modelling of Lamb waves for damage detection in metallic structures: Part II. Waveinteractions with damage

Abstract

Lamb waves have shown great potential for structural health monitoring. The technique isbased on guided ultrasonic waves introduced into a structure at one point and sensed at adifferent location. Damage in a structure is identified by a change in the output signal.However, previous studies show that even simple structural configurations can lead tocomplex response signals. Therefore a knowledge and understanding of wave propagationcan ease the interpretation of damage detection results. This paper reports anapplication of the local interaction simulation approach for Lamb wave propagationmodelling in metallic structures. The focus of the analysis is on two-dimensionalwave interactions with slot-type defects. The method shows the potential forcomplex modelling of acousto-ultrasonic waves in damage detection applications.