Article

Characterization methods of the viscoelastic properties of plastics in multi-material designs (en)

Authors

* Presenting author
Day / Time: 19.03.2024, 15:20-16:00
Room: Glasgang, Posterbereich B
Typ: Poster
Session: Körperschall (Posterbereich B)
Information: Die Poster werden durchgängig von Dienstag bis Donnerstag im Glasgang ausgestellt, sortiert nach thematischen Zusammenhängen in der hier angegebenen Posterinsel (siehe Sitzungstitel). Das Posterforum zur angegebenen Zeit bietet die Möglichkeit, mit den Autor*innen in Diskussion zu kommen.
Abstract: The reduction of vibrations in technical products plays a key role for increasing its perceived quality. To simulate the acoustical behaviour of products in early stages of product development, a high quality of physical and numerical models as well as reliable material parameters are required. Based on methods to determine the viscoelastic properties of plastics, in this work the Oberst method is extended, to increase the precision of the determination of material parameters. In the first step, a method based on Timoshenko beam theory and the resonance curve method (ISO 6721-3) is proposed to estimate the frequency-dependent complex flexural modulus with a frequency approximation of an isolated resonance point. Furthermore, the Oberst method, the bending moment comparison, is adapted for multi material designs of plastics. The standard procedure of the Oberst method is to measure a composite of a soft plastic glued onto a non-viscoelastic base material (e.g. aluminium). Under use of e.g. additively manufactured multi-material design, the glueing can be avoided and based on that the assumptions are better mapped. Simulation results show that the approaches presented in this work improve the quality of the determination of the viscoelastic properties of plastics.