Speaker
Description
The detection of localized material nonlinearities using guided waves is a valuable approach for nondestructive characterization and damage detection due to their ability to propagate over long distances and interrogate inaccessible domains. Of particular interest is the so-called wave mixing, in which the mutual interaction of two primary waves generates a secondary wave field. Phased-array scanning enables control of the location of the mixing-zone of the primary waves while the transmitters remain in a fixed position.Aggravating damage detection, the amplitude of the resulting secondary wave is not invariably cumulative, especially when the group velocities differ and the mixing zones are finite. In addition to the secondary wave, changes in the primary waves, which may be attenuated or modified because of energy transfer to the secondary field, can be considered for the evaluation of measurements and the detection of nonlinearities.This study numerically investigates how the energy transfer affects the amplitudes of propagating primary waves for the detection and assessment of a finite nonlinear material region in an otherwise linearly elastic plate. In addition a parametric study on the mixing-zone size and its influence is presented.