Viscoelasticity of new generation thermoplastic polyurethane vibration isolators

Bek, Marko (author), Betjes, Joris (author), Bernstorff, Bernd Steffen von (author), Emri, Igor (author)

This paper presents the analysis of pressure dependence of three thermoplastic polyurethane (TPU) materials on vibration isolation. The three TPU Elastollan materials are 1190A, 1175A, and 1195D. The aim of this investigation was to analyze how much the performance of isolation can be enhanced using patented Dissipative bulk and granular systems technology . The technology uses granular polymeric materials to enhance materials properties (without changing its chemical or molecular composition) by exposing them to "self-pressurization," which shifts material energy absorption maxima toward lower frequencies, to match the excitation frequency of dynamic loading to which a mechanical system is exposed. Relaxation experiments on materials were performed at different iso- baric and isothermal states to construct mastercurves, the time-temperature-pressure interrelation was modeled using the Fillers-Moonan-Tschoegl model. Dynamic material functions, related to isolation stiffness and energy absorption, were determined with the Schwarzl approximation. An increase in stiffness and energy absorption at selected hydrostatic pressure, compared to its stiffness and energy absorption at ambient conditions, is represented with K_k(p, [omega]), defining the increase in stiffness and K_d (p, [omega]), defining the increase in energy absorption. The study showed that close to the glassy state, moduli of 1190A and 1195D are about 6-9 times higher compared to 1175A, whereas their properties at ambient conditions are, for all practical purposes, the same. TPU 1190A turns out to be most sen- sitive to pressure: at 300 MPa its properties are shifted for 5.5 decades, while for 1195D and 1175A this shift is only 3.5 and 1.5 decades, respectively. In conclusion, the stiffness and energy absorption of isolation may be increased with pressure for about 100 times for 1190A and 1195D and for about 10 times for 1175A. Published by AIP Publishing.

• Language: English
• Keywords: vibration isolators, viscoelasticity, hydrostatics, polymers, continuum mechanics
• Work type: Not categorized
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication version: Author Accepted Manuscript
• Number of pages: 18
• Numbering: 29, 12
• PID: 20.500.12556/RUL-99190
• UDC: 539.3:678
• COBISS.SI-ID: 15825947
• Publication date in RUL: 14.02.2018

Record is a part of a journal

• Title: Physics of fluids
• Shortened title: Phys. fluids
• Publisher: American Institute of Physics
• ISSN: 1070-6631
• COBISS.SI-ID: 37828865

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 08.01.2018

Secondary language

• Language: Slovenian
• Keywords: izolatorji vibracij, viskoelastičnost, hidrostatičnost, polimeri, mehanika kontinuuma

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0264
• Name: Trajnostni polimerni materiali in tehnologije