M. Dorobantu, G. Dumitru, G. M. Dragne, C. Badea, I. Szentes
When being moved with the high speed engines vehicle is undergone high dynamic loads stress. Each of these dynamic phenomena is well known in scientific literature, the phenomenon of hunting. Through the hunting shall mean the coupling of the lateral oscillations of flexuosity. Hunting oscillations arise when a vehicle properly maintained and increasing lateral oscillations develop due to component subassemblies, the resultant reaction forces concerned interacting at the level of the forces that rolling the device as well as the engine drive system of the wheelsets, but also at the level of...
TC15 Youth Symposium 2012
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· 2012
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T. F. Galatanu, V. V. Ungureanu
In this paper is presented the experimental tests of the joint assembly of thin walled steel profiles KB and a numerical experiment. It is highlighted a good behaviour of the KB profiles with the joint element by increasing of bearing capacity and reduction of material quantity by optimum usage of the KB profiles.
TC15 Youth Symposium 2012
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· 2012
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N. Radovic, A. Morri, C. Fragassa
Spheroidal graphite cast iron (SGI) is mainly used in the transportation industry for applications such as engine blocks, turbo housings and exhaust manifolds because of its good castability, machinability, thermal exposure resistance, low cost, high Young’s modulus and tensile strength. Nowadays, a new kind of cast iron known as Compacted Graphite Iron (CGI) or vermicular graphite iron, is replacing SGI because of its better thermal conductivity. This paper presents comparing analysis of SGI and CGI specimens tested under uniaxial tensile loading. Examinations were carried out on tensile...
TC15 Youth Symposium 2012
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· 2012
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J. Kaleta, D. Lewandowski, D. Sawicka
The object of this work was an examination of the microstructure and mapping of chemical elements at the surface of NiMnGa. This material is distinguished by magnetostriction (even 6% of its length), shape memory and magnetocaloric effect. The sample was mounted and then examined with scanning electron microscope using detectors: SE , BSE and EDX (mapping). The structure on the obtained images can be defined as martensitic. The review of microcracks at the surface showed a non-chaotic distribution. The results of mapping of the chemical elements at the surface confirmed the uniform...
TC15 Youth Symposium 2012
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L. O. De Oliveira, P. R. F. Teixeira, E. D. Dos Santos, L. A. Isoldi
This paper presents a preliminary evaluation of the operating performance of an Onshore Oscillating Water Column (OWC) converter submitted to a typical southern Brazilian coast wave. The numerical modelling has been performed using the FLUENT CFD code based on the Finite Volume Method (FVM). The mixture water-air flow is considered to be two-dimensional, laminar and unsteady. The Constructal Design has been applied in order to determine the optimum dimensions of the air chamber of the OWC device. The optimization purpose is to investigate the H 1 / L 1 ratio that reaches the highest power...
TC15 Youth Symposium 2012
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· 2012
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G. S. Husak, F. E. G. Chimisso
This article presents the equipment developed at POLICAB (Stress Analyses Laboratory) and the preliminary experimental results. The project objective was to develop equipment to approaching the test condition to the work condition and characterize the creep behavior of synthetic multifilaments, applied to offshore mooring systems for ultra deep waters. The equipment developed is able to test wet multifilaments simulating the ocean deep water temperature.
TC15 Youth Symposium 2012
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· 2012
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J. Kaleta, D. Lewandowski, R. Mech
Among used in today's engineering materials, the more attention is attached to active materials, defined most often as SMART. Smart Magnetic Materials (SMM) play a big part in this numerous group of materials, from which chosen are an object of described hereafter investigations. One type of SMM are Giant Magnetostrictive Materials (GMM) which can be represented by i.e. Terfenol-D. The biggest difficulty with mechanical application of GMM is its brittleness, as well as appearing of eddy currents near frequencies of work and high price. These disadvantages tend scientists to search new...
TC15 Youth Symposium 2012
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M. Leonhartsberger, M. Reiter, Z. Major
To determine the biaxial deformation and failure behavior of elastomers and thermoplastics a novel testing device along with data acquisition and data reduction software tool was developed and the first results are described in this study. Thin disc shaped specimens are pressurized and in the bulge an out-of-plane biaxial displacement state is realized. Due to the compact form, full-field optical measurements are also possible and were used for determining the biaxial strain components in these experiments. In addition to the monotonic pressure control, cyclic tests with various loading...
TC15 Youth Symposium 2012
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M. Królewicz, M. Przybylski, D. Lewandowski, J. Kaleta
The purpose of this paper was to present the manufacturing process of magnetically polarized (anisotropic) magnetorheological elastomers (MRE) and to investigate their magnetomechanical properties. The materials were based on a thermoplastic matrix, iron particles and additives which improved the plasticity of a resulting composite. A procedure was developed to create specimens with magnetic field-oriented microstructure. MRE with various chemical compositions were subjected to cyclic shearing with the use of a dedicated test stand. The results revealed that selected properties of...
TC15 Youth Symposium 2012
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A. Czernuszewicz, J. Kaleta, D. Lewandowski, M. Królewicz, P. Wiewiórski
The paper presents a test stand to study the magnetocaloric effect. The stand utilises a magnetocaloric material, gadolinium, as a refrigerant. This material was chosen, because of good magnetocaloric properties and suitable work temperature close to the room temperature. The magnetic field of 1 T is generated by cylindrical Halbach array which is a special arrangement of permanent magnets that concentrate and homogenize the magnetic field in the inner gap of the flux source. As a heat transfer medium a special liquid was selected. In addition, the paper provides first results from an...
TC15 Youth Symposium 2012
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· 2012
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