Eventos Anais de eventos
DINAME2019
DINAME2019
A study on the dynamics of a periodic bending-shear-torsion coupled composite beam metamaterial
Submission Author:
Danilo Barros de Araújo Silva , SP
Co-Authors:
Danilo Barros de Araújo Silva, Paulo José Paupitz Gonçalves
Presenter: Danilo Barros de Araújo Silva
doi://10.26678/ABCM.DINAME2019.DIN2019-0164
Abstract
There has been a constant search for materials that present better mechanical characteristics and low-cost, and structural forms that have good behavior to mechanical vibrations. Thus, composite materials and periodic structures have been widely studied. A composite material consists of the combination of two or more materials which together produces desirable mechanical properties, whereas the periodic structure consists of substructures (or unity cell) positioned periodically in a principal structure. This cells produces a variation of the stiffness and in the range of frequency, consequently, in the dynamic behavior of the mechanical structure. The objective of this paper is to present a study of the structural behavior of a beam made of the composite laminated material, subdivided in small structures and assembled periodically. In this work was analyzing the response frequency to elements with 0° and 45° fiber orientations. The periodic structure is built coupling these elements. Through of the results, it was possible to notice that the periodic structure presented a band gap for high frequency (6 at 9 kHz). It has observed that the structure behaves as if there were a torsional dis-coupling. Besides, it verified the relationship between the wavenumber and the fiber orientation for a composite material beam, and the effects of the variation these parameters and the periodic structure in the structural vibration.
Keywords
Composite laminated beam, Periodic structure, Mechanical Vibration, bending-shear-torsion coupling, Timoshenko beam
