Traveling Lamb wave in elastic metamaterial layer

The propagation of travelingLamb wave in single layer of elasticmetamaterial is investigated in this paper. We first categorized the travelingLamb wave modes inside an elasticmetamaterial layer according to different combinations (positive or negative) of effective medium parameters. Then the impacts of the frequency dependence of effective parameters on dispersion characteristics of travelingLamb wave were studied. Distinct differences could be observed when comparing the travelingLamb wave along an elasticmetamaterial layer with one inside the traditional elastic layer. We further examined in detail the travelingLamb wave mode supported in elasticmetamaterial layer, when the effective P and Swavevelocities were simultaneously imaginary. It was found that the effectivemodulus ratio is the key factor for the existence of special travelingwave mode, and the main results were verified by FEM simulations from two levels: the level of effective medium and the level of microstructure unit cell.

Source: Journal of Applied Physics - October 25, 2016 Category: Physics Authors: Haisheng Shu, Lihuan Xu, Xiaona Shi, Lei Zhao and Jie Zhu Source Type: research