This paper is aimed to introduce the reader with the specifics of viscoelastic materials, and physical background of their time-dependent behaviour during exploitation period. It points out, how the selection of viscoelastic material in combination with thermo-mechanical conditions during the processing might affect the functionality and long-term behaviour of a product in use. Both can be considered and analysed by characterizing material properties through which material and technology effects are manifested in different mechanical responses to the certain loading conditions. In relation to this, fundamental viscoelastic material functions are presented in the article, as the main characteristics to evaluate functionality and long-term behaviour of time-dependent (viscoelastic) materials.
F.30 Professional assessment of the situation
COBISS.SI-ID: 12607515In the recent years different types of dampers for structural control in civil engineering have been developed, where one of the most promising solutions are viscoelastic dampers. In this paper we demonstrate that by utilizing knowledge on the effect of inherent hydrostatic pressure on the time- and frequency-dependent behavior of polymers it is possible to design and build the ultimate insulation systems for civil engineering applications. An optimal solution is achieved by using highly pressurized multimodal granular polymeric materials. The results on case material, Thermoplastic Polyurethane, showed that by increasing inherent pressure of the material from 1bar to 2000bar the frequency at which material exhibits its maximal damping properties was shifted from 37 kHz, at P=1bar to 235Hz at P=2000bar. At the same time, the increase of inherent hydrostatic pressure from 1 bar to 2000 bar changes material stiffness up to 2.5 times, while the damping properties increase up to 5.2 times.
B.04 Guest lecture
COBISS.SI-ID: 13174555Rector's award for the Best Innovation of University of Ljubljana is organized with the aim to support innovations and innovative business ideas to enter the market, either in a framework of own company or in any other form, for example in the form of sales or licensing of the patent or knowledge. Technology dissipative granular materials allows optimum utilization of the damping properties of polymeric materials and thus the maximum reduction of vibration and noise. For a project of Technology of dissipative granular materials, the research team received third place at Rector's award for the Best Innovation of University of Ljubljana.
E.01 National awards
COBISS.SI-ID: 13347867Mechanics of Time-Dependent Materials (MTDM), published by Springer, is an international journal devoted to the time-dependent behavior of materials and structures. A quarterly journal is published through a joint arrangement between the Society of Experimental Mechanics and (SEM) and the Society of Plastic Engineers (SPE) since 1996. MTDM promotes the transfer of knowledge between various disciplines that deal with properties of time-dependent materials, approaching from different angles. Professor Igor Emri is elected Editor-in-Chief (for Europe, Asia and Africa) of MTDM, published by Springer Science+Business Media Dordrecht. Position of an Editor-In-Chief provides a solid insight into the current state of the art in the field of behavior of time-dependent materials.
C.04 Editorial board of an international magazine
The European Masters in Engineering Rheology – EURHEO offers an advanced integrative interdisciplinary education programme on Rheology and its applications to different Engineering areas. EURHEO combines the expertise of seven leading European Universities. Pursuant to the rules of the European postgraduate schools, each student participating in the EURHEO programme has to do research work in at least three universities in three countries. On completion of their studies, students receive two diplomas.
D.02 Establishment of a research centre, laboratory, study course, association