Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
VIBRATION ATTENUATION IN COMPOSITE MATERIALS BY VISCOELASTIC MATERIALS
Submission Author:
Herbert Gomes , RS
Co-Authors:
Herbert Gomes, Alexandre Löw
Presenter: Herbert Gomes
doi://10.26678/ABCM.COBEM2023.COB2023-0190
Abstract
Damping in materials is a topic that has not yet been completely solved due to the uncertainty of its origin, which can be diverse. Due to their excellent qualities of strength, flexibility, and lightness, composite materials are increasingly being used in everyday systems that were previously created with metals. The applications range from the automotive system to aerospace, being used to build aircraft wings, wind turbines, pressure vessels, and fairings parts, among others. When loads and vibration modes are in resonance, problems with vibration might occur in composite material constructions. With proper damping control, this problem can be somewhat mitigated. In this article, we conduct an experimental investigation of the damping in composite materials and its relationship with layers of viscoelastic material. Viscoelastic materials are used to increase vibration attenuation. Five different viscoelastic materials in tape format, each 50 mm wide, were employed during the tests. A test matrix with various viscoelastic materials applied to the composite sheets in various positions and circumstances was used in an experimental research that used damping identification procedures. The viscoelastic materials were (a) regular electric insulating tape (b) self-adhesive asphalt blanket (c) longitudinal fiberglass-reinforced adhesive tape (silver tape) and (e) longitudinal fiberglass-reinforced adhesive tape. By the measured results presented in the paper, the standard deviations of the measurements present values of at least one order of magnitude smaller in relation to the measured values being an indication of the good repeatability of the experiment. Additionally, it was found that the sample made of self-adhesive aluminum tape not only had the highest damping ratio values, but also the least amount of mass added to the system. This makes it obvious to support the idea that the treatment with this material was the main cause of changing in damping.
Keywords
Composite Materials, damping identification, viscoelastic materials, mechanical vibrations.
