Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Investigation of a novel metastructure with trapped, fluid-filled unit cells
Submission Author:
Thiago de Paula Sales , SP
Co-Authors:
Vinícius Santos, Thiago de Paula Sales, Morvan Ouisse
Presenter: Vinícius Santos
doi://10.26678/ABCM.COBEM2023.COB2023-1067
Abstract
The interaction between fluid and structure has long been a subject of interest in various engineering disciplines. Recently, microporous-like periodic structures with entrained fluid have demonstrated remarkable wave propagation properties, offering potential for designing versatile metamaterials. In this study, a novel metamaterial concept is proposed and investigated using the Wave-based Finite Element Method (WFEM). The metamaterial comprises a periodic-like structure manufactured through fused filament deposition, featuring internal cavities filled with water. Experimental characterization of the dynamics of the periodic system without internal fluid confirms good agreement with numerical predictions, obtained through frequency response function measurements. Furthermore, the dynamic behavior of the two-phase periodic metastructure is experimentally examined, where waves interact within the heterogeneous medium consisting of both fluid and solid phases. In this case, the resulting wave characteristics depend on the properties of both phases. It was shown that the fluid-filled metastructure exhibits a significantly wider bandgap compared to the periodic system lacking internal fluid, owing to the system's periodicity, mass increasing, and damping effects. Consequently, this work presents a promising avenue for metastructure design, with potential applications in structural dynamics and acoustics.
Keywords
metamaterial, Bandgap, periodic structures, fluid-structure interaction, wave-based finite element method
