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Sizing of Through-Thickness Circular Holes in Plate Structures by Ultrasonic Lamb Wave Testing

Abstract. Lamb waves can be used for evaluating the integrity of plate and shell structures. In ultrasonic testing of materials, Lamb waves are potentially attractive solutions when tests need to be done on a large area of a plate or shell. They are launched on a small area of the structure and can travel long distances. Many researchers have investigated the application of Lamb waves in estimating the location of defects, but very few people have considered the sizing of defects by this method. In this paper, an analytical model based on higher order plate theory is used to predict the scattering of the lowest order symmetric Lamb wave from a circular through-thickness hole. Based on this model and by incorporating a genetic algorithm, the dimensions of an unknown circular through-thickness hole have been estimated. The validity of the proposed method is verified by experiments.