Excitation of longitudinal and Lamb waves in plates by edge-mounted transducers

摘要

Lamb waves have been extensively studied for the detection of flaws in plate-like structures. However operation at low f·d products is usually recommended in order to eliminate the complications of multiple Lamb modes, and low f·d products lead to reduced scattering from small defects. Here we explore the generation of waves at higher f·d products. We explore the transition between the generation of multiple Lamb modes and the generation of a train of nearly longitudal pulses. We also investigate the transfer of energy from the leading to trailing pulses along with the scattering of the pulse train by simulated defects.