Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Exploring the Vibration Characteristics of Auxetic Tubular Structures: An experimental analysis
Submission Author:
Rafael Augusto Gomes , MG
Co-Authors:
Adrien Noël , Rafael Augusto Gomes, Lucas Antonio de Oliveira, Sebastião Simoes Cunha Jr, Guilherme Ferreira Gomes
Presenter: Sebastião Simoes Cunha Jr
doi://10.26678/ABCM.COBEM2023.COB2023-0195
Abstract
The exceptional mechanical properties of auxetic structures, known for their negative Poisson's ratio, offer significant improvements compared to conventional structures. The present study conducted a comprehensive analysis and comparison of the vibration responses in three auxetic tubular structures, all sharing identical parameters but featuring distinct unit cell models: Reentrant, Double-V, and Anti-Trichiral. Vibration tests were systematically executed on standardized samples with uniform dimensions in terms of diameter and height. These tests employed two different materials: PLA and PLA-Carbon filament. The ensuing free vibration tests furnished essential modal data regarding natural frequency and structural damping. The experimental outcomes revealed that auxetic tubular structures fabricated from PLA reinforced with carbon fiber exhibited superior stiffness and damping properties when contrasted with their PLA counterparts. As a result, the reentrant unit cell configuration displayed a 5% and 8% improvement in damping capacity compared to the Double-V and Anti-Trichiral structures, respectively, when using PLA. When utilizing PLA-Carbon, the reentrant unit cell arrangement demonstrated 4% and 23% enhancement in damping capabilities relative to the Double-V and Anti-Trichiral structures, respectively. This study delivers valuable insights into the behavior of diverse auxetic cell types composed of two different materials when subjected to vibrational forces within tubular structures.
Keywords
Auxetic, Tubular structure, Additive Manufacture, Vibration Analysis
