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Erschienen in:
2017 | OriginalPaper | Buchkapitel
15. Using Hydrostatic Pressure to Maximize Frequency Dependent Damping Properties of Thermoplastic Polyurethane
verfasst von : M. Bek, I. Emri
Erschienen in: Challenges in Mechanics of Time Dependent Materials, Volume 2
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Abstract
One of the ways to reduce vibration transmission between source and receiver is by using polymeric damping elements. Comparing polymeric materials shows that polymeric materials with high damping factor tan δ exhibits lower stiffness compared to polymeric materials with lower damping factor. Due to their insufficient stiffness polymers with better damping are often not being used for vibration isolation. In addition, elastomeric materials with higher damping exhibit maximal damping values at high frequencies, often in frequency range far away from our hearing range. Combining both facts leads to the conclusion that there is still room to increase damping properties of polymeric material.
This paper is a continuation of previously presented work on this topic with aim to demonstrate how exposing elastomeric material to the hydrostatic pressure we can affect its frequency dependent mechanical properties. This allows full utilization of damping potential of the selected material and maximize the damping effect of the damping element. Using this unique property of viscoelastic materials enables one to designed adaptive damping elements which can be used in railroad applications as well as in other relevant cases. To demonstrate the effect of inherent hydrostatic pressure on damping behavior three thermoplastic polyurethanes were selected.