Michaela Kostelecká, Daniel Kytýř, Tomáš Doktor
Results from series of tests carried out on nine mixture formulas are the main data set. Asbestosfree plates bonded by hydro-silicate matrix and reinforced by organic fibers were produced from these mixture formulas. Within the scope of this project, the following activities were carried out: finding out the dimensional and weight characteristics of the plates, bending strength under normal conditions, the influence of frost on bending strength, the influence of putting the plates into hot water on bending strength, the impermeability of plates and measurement of change of length in the...
TC15 Youth Symposium 2011
· TC15
· 2011
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Rainer Klauke, Jörn Ihlemann
In opposition to metallic materials, technical elastomers exhibit a variety of different material properties like nonlinearity or inelastic material behavior. The measurement of those properties and the determination of the material parameters connected to them often requires several different experimental setups. In the presented article the setup of an experimental rig is introduced, which allows the measurement of dynamic parameters, while at the same time the input signals preserve a quasi-static character. With the experimental rig it is possible to decouple elastic and inelastic...
TC15 Youth Symposium 2011
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· 2011
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Paweł Kaczyński
Clinch joining technique can be successfully used in many industries for joining of thin-walled profiles. This solution brings multiple benefits to the producers. The most important are: elimination of metal surface preparation, reduction of the energy consumption and negative influence of the heat zone. Furthermore, joining process does not cause bore dust, and does not require gas shroud, generating noise at a low level of intensity.
TC15 Youth Symposium 2011
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· 2011
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Ines Jölly, Andreas Hausberger, István Gódor, Thomas Schwarz
Mechanical seal performance critically depends on the tribological performance of the sealing material. Former research work clearly indicates that the in service behaviour of TPU seals is associated with the sliding velocity ( v ) and the contact pressure ( p ), hence a compelling testing process to determine and compare the friction and wear related properties based on pvvariations is of outermost importance. This paper chronicles an implementation approach for the development of a testing methodology capable to declare the p - v -dependency on the tribological performance.
TC15 Youth Symposium 2011
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· 2011
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Franz Hiptmair, Zoltan Major, Vitor Barroso, Sabine Hild
To assess the applicability of magnetic metallic particle filled soft polymeric materials (i.e. gels and elastomers, termed as magnetoelastomers) for practical industrial applications, comprehensive characterization of the rheological and mechanical behaviour is essential. For this study Polydimethylsiloxane (PDMS) was selected as matrix-material. Iron particles of various shapes (aspect ratios) and surface treatments were added as fillers in various amounts. Isotropic specimens were prepared and subjected to rheological and dynamic mechanical measurements in presence or absence of...
TC15 Youth Symposium 2011
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Désirée Gröber, Erhard Leidich, Bohumil Brůžek
Knowledge of occurring friction is very important in mechanical engineering – both in order to ensure reliable friction-locked joints and to reduce energy loss. Friction coefficients are influenced by many factors, like hardness, material strength and structural conditions. These materials properties can be improved through ultrafine graining of aluminium alloys by equalchannel angular pressing (ECAP) with subsequent aging treatment. Therefore the influence of ECAP material conditions on the frictional behaviour of 6082 aluminium alloy is investigated in this paper.
TC15 Youth Symposium 2011
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Joanna Furgała, Stanisława Szarska, Jerzy Detyna
Several research focuses on assessing the properties of contact lenses, due to the increasing number of users, whose needs grow because of the conditions in which they work (work at the computer room air-conditioned). The main aspect of providing comfortable wearing contact lenses is their good wettability. Studies on wettability are evolving all the time because of the difficulties to be faced, e.g. incomplete blinking. Hence the search for closest to the natural conditions of the test method,which reflects the reaction of the cornea-contact lens-tear film. In order to understand the...
TC15 Youth Symposium 2011
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Tomáš Doktor, Daniel Kytýř, Jaroslav Valach , Ondřej Jiroušek , Michaela Kostelecká
Knowledge of the inner structure is an important prerequisite for estimation of the mechanical properties of heterogeneous materials. This article is focused on the assessment of pore size distribution of a porous material.
TC15 Youth Symposium 2011
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Adam Czech, Sascha Müller, Lothar Kroll
Volume computer tomography (VCT) is an established non destructive testing method, which offers the possibility to capture internal structural damage three-dimensionally. Thus, the complex failure mechanism of endless fibre reinforced plastics can be visualized and classified into the basis failure modes: fibre failure (FF) and inter fibre failure (IFF) taking different loading types into account: tension, compression and shear. A new approach analyzes these VCT data in combination with image processing algorithms to identify the anisotropic damage parameters of pre-damaged CFRP tubes in...
TC15 Youth Symposium 2011
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Barthel Brylka, Felix Fritzen, Thomas Böhlke, Kay André Weidenmann
The investigations presented in this paper focus on the simulation of push-out tests on a long fibre reinforced thermoplastic (LFT) manufactured in a compression moulding process. The microstructure of LFT is strongly influenced by the manufacturing process and shows inhomogeneous distribution and orientation of the glass fibres. Figure 1 shows the surface of a polished specimen, which has been cut normal to the melt flow direction. The influence of geometrical parameters like, e.g., fibre arrangements and fibre misalignment is still not fully understood. For the interpretation of...
TC15 Youth Symposium 2011
· TC15
· 2011
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