Applied Mechanics and Materials Vol. 736

Abstract: This paper presents the effect of surface roughness on soft elastohydrodynamic lubrication in circular contact with non-Newtonian lubricant. The time independent modified Reynolds equation, elastic equation and lubricant viscosity equation were formulated for compressible fluid. Perturbation method, Newton-Raphson method, finite different method and full adaptive multigrid method were implemented to obtain the film pressure, film thickness profiles and friction coefficient in the contact region at various the amplitude of surface roughness, surface speed of sphere, modulus of elasticity and radius of sphere. The simulation results showed that the film thickness in contact region depended on the profile of surface roughness. The minimum film thickness decreased but maximum film pressure and friction coefficient increase when the amplitude of surface roughness and modulus of elasticity increased. For increasing surface speeds, the minimum film thickness and friction coefficient increase but maximum film pressure decreases. When radius of sphere increases, the minimum film thickness increases but maximum film pressure and friction coefficient decrease.

Abstract: This paper is dedicated to the development and optimization of the porous titanium materials suitable for biomedical usage in traumatology. Main aim of the presented research activities is focused on preparation of biocompatible titanium based materials with controlled porosity. It was found that titanium specimens with total porosity approximately 40 % revealed mechanical properties very similar to those of human cortical bone. Two-layer specimens with controlled porosity were prepared and tested by electron microscopy for post-sintering cracks. All tested specimens with controlled porosity were cracks free. Future works will include preparation of geometrically more complicated shapes, machining and in vitro cells proliferation testing.

Abstract: The aim of this research was to find the efficiency ways to treat wastewater from dye tie dye technique by using an effective wastewater treatment system and find out how to implant the technology of the waste water treatment system to help the problems of the community activities which the tie-dye fabric were the major product of their area. The wastewater from the tie-dye industry were collected and were treated with physical, chemistry and biological treatment by using local materials such as sea shell, alum and clay in a laboratory scale. The data from the treatment were used in the designing the small scale water treatment and apply to the study area. Moreover, the treatment technique knowledge will transfer to the community and establish guidelines for community Wastewater treatment. The COD of wastewater from the dying materials of Bark of Xylocarpus granatum, Bark of Sea almond and Bark of Ebony tree seed were 479.2, 428.5, and 564.2 mg/l, respectively. The water quality were improved better up to 83.61% after were treated with the treatment technique. The satisfaction of the community that participate in the training, technology transfer and adoption of guidelines for therapists to use in the community were found that 86 percent had gained the knowledge in wastewater treatment, 95 percent were satisfied and 85 percent of knowledge were benefit to the community, respectively.

Abstract: We present an analysis of residual stresses in longitudinal and transversal direction of a bimorph element induced by a change in external temperature field due to mismatch in thermal and elastic characteristics in dissimilar two-phase composite material with laminated structure. Representative Volume Element of the system is defined as a heterogeneous two-phase layered element bonded at an interface in a sense of coherent bi-layer, where each phase possesses distinct anisotropic material characteristics. We use a homogenization procedure with particular form of strain field, which satisfies compatibility equations in the bulk and at an interface. Special rule of mixtures derived from a spatial averaging principle yields explicit dependence of through-thickness residual stress on a compositional parameter defined as a volumetric fraction of one phase of the system.

Abstract: The article deals with analysis of thin steel sheets formability. The aim is to verify possibilities of formability of metal sheet with thickness 0.85 mm according to material properties reached from experimental tests by numerical simulation. Simulation has been realized on two models with analysis of resulting data. Reached values can be used during simulation of real forming process.

Abstract: This paper determines deformation law of the new and old subgrade differential settlement by studying on subgrade deformation characteristics and control methods, mainly by using the method of numerical simulation under certain conditions. By comparing the subgrade differential settlement before and after preloading, it is confirmed that preloading treatment can be used to prevent the road structure from the effect of differential settlement during and after highway widening construction process.

Abstract: This work is devoted to modeling of physical subsystem, considering an electromagnetic exciter of low-frequency oscillations (EME LFO) as it, which is a classic example of an electromechanical system. For the simulation of electromagnetic exciter of low frequencies Simscape was chosen. Based on the principle of operation (reciprocating motion due to the configuration of the resonance circuit), and the structure of the apparatus, there is detected the operation character with several types of energy conversion: electrical to magnetic and magnetic to mechanical. And the main requirement to the developed model is the conservation of energy and power under the corresponding transformations.

Abstract: The present paper aims to approach from a theoretical and experimental point of view an important topic in terms ofoperational safety of the polyethylene pipes used in natural gas distribution.

Abstract: In this paper, by regulating the dipole-dipole interaction between atoms, we can successfully control the behavior of single-photon transport in one-dimensional waveguide cavity. Our findings indicate that the dipole-dipole interaction is equivalent to the positive detuning. Furthermore, we also found that there is a competition between dipole-dipole interaction and the atom-cavity coupling. In addition, we also studied the influences of dipole-dipole interaction on transport spectrum under extreme conditions of high and low energy.

Abstract: Through researching we can draw two conclusions. One conclusion is controlling the symmetric and asymmetric atomic - photon coupling interaction is a good way to control the transmission spectrum of incident light. Another conclusion is that multi-frequency photon attenuator can be controlled by asymmetric atomic - photon coupling interaction.