P. Stelzer, M. Reiter, Z. Major
This paper presents the simulation of the tensile modulus and the tensile strength of short glass fibre reinforced Polypropylene. Various formulae of the shear-lag theory were implemented in an analytical calculation program to evaluate the tensile strength values. Based on the homogenization approach the modulus values and the strength values, applying an existing failure criterion, were calculated with a material modelling software. It is shown the microstructure dependence, especially of the fibre weight fraction and fibre orientation, of those mechanical properties.
TC15 Youth Symposium 2012
· TC15
· 2012
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O. I. Németh, Gy. Farkas
In our long-term research, the strength and physical characteristics of concretes with unsaturated polyester binder and their influencing factors are specified. This study is intended to determine how the values of compression strength and flexural strength are affected by the mixing temperature. Our experiments show, that the compression strength of polymer concrete is significantly decreased just by low temperatures (close to the melting point of catalyst). Flexural strength is not affected significantly by temperature. The reasons for this discrepancy should be further examined later on,...
TC15 Youth Symposium 2012
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· 2012
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P. Koudelka, T. Doktor, J. Valach, D. Kytýr, O. Jiroušek
During the last decades, there has been much effort on the determination of effective elastic properties of porous metals. In this paper, the overall elastic moduli of reference aluminium foam Alporas are assessed using predictive methods based on definition of compliance contribution tensor. Surface of the foam is captured using flatbed scanner and such data are subjected to image and signal processing routines in order to obtain dimensions of the sufficient representative volume element and calculation of structural characteristics for analytical homogenization. It is shown that only the...
TC15 Youth Symposium 2012
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· 2012
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K. Vogel, D. Wuensch, S. Uhlig, J. Froemel, F. Naumann, M. Wiemer, T. Gessner
Wafer bonding is a key technology in the manufacturing of microelectronic and micromechanical systems on industrial scale. Especially glass frit bonding is often used for the encapsulation of MEMS devices on wafer level. To ensure the reliability of these bonds and to prevent critical failure of the systems, characteristic mechanical properties of the bonded interface are required. The fracture toughness and the shear strength are suitable values to characterize the bonding strength and can be determined by micro chevron and shear testing. They depend on the bonding parameters as well as the...
TC15 Youth Symposium 2012
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· 2012
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Z. Zimniak, M. Marciniak, M. Zalewski, R. Bedzinski
Titanium is one of the most desirable material due to its durability, low density, toughness, corrosion resistance, highly creepresistant and biological compatibility. All of these mechanical and physical qualities make titanium useful in almost every area of life, especially in biomedical engineering. In ossiculoplasty they play important role, because it is possible to create very small prosthesis, which is light, strong and has satisfactory acoustic properties. This paper presents results of uniaxial compression experiments on cylindrical samples.
TC15 Youth Symposium 2012
· TC15
· 2012
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A. I. Botean, I. Takacs, M. Hardau
Considering bipodal position, each of the two femoral bones take over half the body weight, the main load that they are subject to beeing the eccentric compression. The purpose of this paper is the qualitative evaluation of the femoral bone in the proximal area. The experimental method used is photoelasticimetry through transparency, while for the numerical analisys we used the finite element method (ANSYS).
TC15 Youth Symposium 2012
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· 2012
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A. I. Botean, M. Simion
The aim of this paper consist of numerical and experimental determining of stresses for a simple structure of the industrial robot type SCARA, with one degree of freedom. The numerical study is realized using finite element method (Ansys 12.1) and the experimental study by photoelasticity method.
TC15 Youth Symposium 2012
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· 2012
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D. Károly, Z. Kakasi, E. Bognár, P. Szabadíts
This article introduces five measurement methods for investigation of functional properties of coronary stent systems. The properties were analysed in theory, and then several stents were measured and evaluated. Crossing profile, flexibility of the stent system, foreshortening, metallic surface area, the largest and the smallest cell sizes, the maximum achievable cell diameter and side branch access were measured. Four types of coronary stents were examined, two pieces from each type. The results show that the properties mostly depend on geometry, stent pattern and material. These...
TC15 Youth Symposium 2012
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· 2012
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A. Donesz-Sikorska, J. Krzak-Ros, D. Grygier, J. Kaleta
Metals and their alloys are the basic materials using for bone implants. Unfortunately all metallic biomaterials contain an elements which may cause metallosis or corrosion, and their surface may not promote colonization by cells of the surrounding tissue. In this paper, we describe obtaining of new coating materials on commercial available steal that can work as biofunctional and well-protecting coatings for medical implants. Thin silica and titanium films were synthesis using the sol–gel method that is based on the hydrolysis of alkoxide precursors at room temperature. The results of our...
TC15 Youth Symposium 2012
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· 2012
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C. Dudescu, J. Naumann, M. Stockmann
The optical measurement techniques have shown more precise results about the mechanical behaviour of materials. They enjoy the advantages of being non-contact, full-field, with a high spatial resolution and offer the possibility to observe the local mechanical behaviour. The paper presents the analysis by Electronic Speckle Pattern Interferometry (ESPI) of the unloading behaviour of metal sheets that undergone large plastic deformations. The springback of the sheet metals after large deformations during deep drawing is not a strongly linear process with a constant Young’s modulus but, the...
TC15 Youth Symposium 2012
· TC15
· 2012
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