Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Effects of 3D printing variability on the vibration attenuation of metamaterial beams
Submission Author:
Adriano Todorovic Fabro , DF , Brazil
Co-Authors:
Adriano Todorovic Fabro, Danilo Beli, José Arruda
Presenter: Adriano Todorovic Fabro
doi://10.26678/ABCM.COBEM2019.COB2019-0496
Abstract
In this work, the physical effects of the material variability on the attenuation performance of metamaterial beams is investigated experimentally and numerically. The additive manufacturing produces spatially correlated uncertainty for the material properties, which breaks the translational periodicity affecting the wave propagation performance of the periodic structures. The wave attenuation is analysed in the beams individually and in ensemble, and it is shown that the attenuation bandwidth increases until an optimal disorder. After that, the band gap mistuning loses vibration attenuation performance. In addition, it is also shown that the variability induces wave trapping, which is created by the band gap tailoring in space and depends on the excitation location. These two interesting physical phenomena, bandwidth widening and wave trapping, were experimentally observed in metastructures constructed from 3D printing. This study illustrates the physical consequences of the variability on the wave propagation of metamaterials constructed in additive manufacturing when compared to the periodic nominal design.
Keywords
metamaterial, uncertainty, wave trapping, Additive manufacturing
