Papers - Archive

Nr 2/2018 - Abstracts

Elastomery nr 2/2018 cover

Kamila Błażek, Paulina Parcheta, Urszula Ostaszewska, Janusz Datta

The effect of cellulose technical fibers on the selected properties of natural rubber composites

The purpose of these investigations was to examine the influence of technical cellulose fibers (10, 20, 30 and 40 parts per hundred rubber) as a filler on the selected properties of natural rubber composites. The tensile properties, tear resistance, hardness, rebound resilience and abrasion resistance were investigated. The comparison between properties of obtained composites and reference sample was demonstrated. It can be stated that increasing amount of cellulose fibers causes longer vulcanization time and deterioration of selected mechanical properties of natural rubber composites.
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Przemysław Jaszak

Rationalization of the shape of the rubber diaphragm of shut-off valve

The paper presents the method of modeling the operation of the shut-off valve. The main goal of the work was to increase the fatigue life and improve the degree of internal tightness of the valve, by properly forming the rubber diaphragm and selecting the adequate material for its performance. In order to verify the causes of failure of the original structure, a numerical analysis was carried out. This allowed determining the stress distribution at failure place. The simulation was carried out using the finite element method. To reflect the non-linear properties of the rubber material, a hyperelastic material Mooney-Rivlin model was used. Thanks to numerical analysis and subsequent attempts to modify the geometry of the diaphragm, the stress at the location of the original damage was reduced, and the required contact pressure affecting the level of internal tightness of the valve was ensured. The shape of the membrane obtained as a result of successive iterations of numerical calculations was tested experimentally. Eventually, the number of valve opening and closing cycles increased from 5 to 298.
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N.R. Prokopchuk, R.M. Dolinskaya, A.Y. Poloz, Y.R. Ebich

Viscoelastic transition and properties of the filled wear-resistant epoxy composites

Viscoelastic properties of the filled epoxy composites on the basis of diane resin ED-20 are studied at 60-140°C depending on concentration of a filler, silicon carbide. Different properties of composites caused by change of an energy ratio of elastic and viscous deformation are shown. These energies of deformation of composites, in turn, are defined by morphology of the strengthening low-ductile filler.
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