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Mechanical characterisation of energy dissipation in silicone elastomer blends / submitted by Rene Preuer, BSc.
Weitere Titel
Mechanische Charakterisierung der Energiedissipation in Silikonelastomermischungen
AutorInnenPreuer, Rene Patrick
Beurteiler / BeurteilerinGraz, Ingrid
ErschienenLinz, 2018
Umfang78 Seiten : Illustrationen
HochschulschriftUniversität Linz, Masterarbeit, 2018
Abweichender Titel laut Übersetzung der Verfasserin/des Verfassers
Schlagwörter (DE)Kugelfallversuch / Silikonelastomer / Energiedissipation
Schlagwörter (EN)silicone elastomer / energy dissipation / sphere drop test
URNurn:nbn:at:at-ubl:1-24144 Persistent Identifier (URN)
 Das Werk ist gemäß den "Hinweisen für BenützerInnen" verfügbar
Mechanical characterisation of energy dissipation in silicone elastomer blends [112.98 mb]

Elastomers are viscoelastic, their internal network structure enables them to convert mechanical energy into heat. They respond not only dependent on mechanical load, but also on strain-rates or temperature gradients and thus allows for superior adaptiveness in most damping problems. Blending elastomers, that are miscible and even crosslink with each other, utilizes the thermo-mechanical properties of each components and allows to tailor the behaviour of the resulting materials. In this thesis two platinum-catalysed poly(dimethylsiloxanes), Sylgard 184 and Ecoflex 00-30, with different mechanical properties such as elongation at break, Youngs modulus and rebound resilience are blended. The multi-component elastomers are prepared by adding Ecoflex 00-30 in 10 % steps, while simultaneously decreasing the amount of Sylgard 184. The base materials and blends are characterized using a custom-built sphere drop test, where a steel sphere impacts onto a cylindrical damping element under test. The spheres motion is tracked and the rebound resilience, coefficient of restitution, energy ratio and dissipated energy are evaluated. Additionally uniaxial tensile tests and dynamic thermomechanical analysis (DTMA) are performed to validate the sphere drop tests. All experiments show that both pure Sylgard 184 and pure Ecoflex 00-30, despite their extremely different Youngs moduli, clearly have the highest damping capacity (= lowest rebound resilience) while the blends (with moduli in between both pure elastomers) exhibit, depending on the temperature, a local minimum in damping at around 6070 % of Ecoflex 00-30 content. Independent of the mixing ratio, the damping capacity exhibits a decline with increasing temperature and an increase with frequency. The results of the experiments are verified by means of theoretical models. Both, experimental and theoretical data, are in an excellent agreement, confirming the sphere drop test as a simple but effective alternative to conventional measurement approaches.

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