Applied Mechanics and Materials Vol. 302

Abstract: In the present study, the strength characteristics of weld zone in the extruded Al6082-T6 has been investigated both by experiment and finite element analysis. The measured heat affected zone was modeled by the combination of deposited metal and a base metal with randomisation. Results from the randomised finite element analysis were compared with tensile test data depending upon the fracture behavior and strength characteristics of weld zone. Three cases of the randomised macro mixing of two materials in HAZ with three types of mixing ratios. Among them, the case 3, which contains the smallest amount of the portion of the base material, showed good agreement with experiment within the allowable error of 12%.

Abstract: The purpose of this study is to enhance the mechanical strength of specimens containing fly ash from fluidized bed type boiler, which the recycling rate will be eventually increased. Specimens containing fly ash in a certain portion were made and aged for 3, 14, and 21 days. The carbonation process under the super critical condition was performed to enhance the mechanical property of specimens by filling the voids and cracks existing inside cement specimen with CaCO3 reactants. The additional aging effect after the supercritical carbonation process on mechanical strength of specimens was also investigated by comparing the compressive strength with and without 7 day extra aging. Carbonation under the supercritical condition and additional 7 day aging was very effective for enhancement of mechanical strength and compressive strength increased by 44%, which reached up to 88MPa.

Abstract: The paper presents the results of the pulsed beam effect on the structure and phase composition of zirconium alloy. Such treatment is demonstrated to lead to forming of complex morphology martensite in the surface layer of the alloy. The processes of hydrogen absorption by zirconium alloy with modified surface have been studied. Modification of the samples is found to reduce the amount of hydrogen, absorbed by the volume of zirconium alloy during hydrogenation.

Abstract: Telescopic aerial boom system is used transport the object or can be used to ease working high altitude. Installation of high voltage transmission tower due to urbanization is increasing. Because working on high places such as wiring operations and electrical maintenance has increased the demand.Boom of aerial work platform are made of steel. So, necessity for safe isolation aerial work platform used for electrical work is increasing. This paper is proposed about applied to the material used in the aerial work platform boom. Insulating material was applied to the aerial work platform the last end boom in boom system. In this paper the structural analysis and formulation of the methodology for the design optimization of telescopic aerial lift boom system is presented. The main objective of the design optimization is to obtain lightweight boom system by optimizing boom cross-section shape, overlap length and plate thicknesses in the worst condition possible. The design optimization problem is formulated as minimizing the weight of the boom system. In this paper analyzes the design of the telescopic aerial boom system of applying the insulating material using the Ansys.

Abstract: The effect of the addition of 0.2-0.65 at% of V on the glass forming ability and mechanical properties of Al88Y7Fe5 alloy were investigated. The addition of V in this range had little effect on the glass forming ability of the alloy, but lowered the tensile strength of the amorphous ribbon. The fracture surface of Al88Y7Fe5 amorphous ribbons was typical vein pattern for ductile metallic glasses, however, that of the alloy with 0.5% V addition changed to two different regions, i.e., vein pattern region and smooth region. At high magnification, the smooth region was composed of nanometer sized corrugations, which is typical for brittle metallic glasses.

Abstract: Experimental results on the impact of pulsed ion beam with parameters the pulse duration 80 ns, energy of 200 keV and current density 120 А/сm2 , pulse energy ~ 1,5 J/сm2 on the alloy Zr1Nb on structure – phase state of the alloy of zirconium Zr1Nb. It is shown that such irradiation leads to changes in the structure of the surface and the hardening of the material.

Abstract: The artificial aggregates were fabricated by two sintering methods to recycle the dredged soil produced at thermal power plant in Korea. The first one is the direct sintering method in which the green body is to put into the furnace of preheated at the desired temperature, and the other is the temperature-rising sintering method in which the green body is to put into the furnace of 800~900 oC, heated with a heating rate of 15 °C/min to the final sintering temperature. The aggregate manufactured by the direct sintering method showed the highest bloating behavior than that of the temperature-rising method. To provide the holding time in the input step was to decrease the bloating behavior in the temperature-rising sintering method. The water absorption for the all aggregates was decreased with sintering temperature, and the values of aggregates made by direct sintering was higher than that of the temperature-rising sintering method. The aggregate made of dredged soil by using various sintering methods had the specific gravity of 0.9~1.8 and water absorption of 3~14 %, and so could be applicable for many fields such as civil, environmental, and agricultural engineering fields.

Abstract: Optimal operating parameters for the study of titanium-hydrogen system with the help of glow discharge optical emission spectroscopy have been selected. Hydrogen distribution from the surface to the depth in technically pure titanium alloy after electrochemical hydrogen saturation has been studied.

Abstract: The paper presents an experimental investigation of using a Molten Carbonate Fuel Cell (MCFC) for reducing CO2 emission from the flue gas of a hard coal fired boiler. The MCFC is placed in the flue gas stream and separates CO2 from the cathode side to the anode side. As a result, a mixture of CO2 and H2O is obtained; from which pure CO2 can be obtained by water condensation. The main advantages of this solution are: additional electricity generated, reduced CO2 emissions and higher system efficiency. The results obtained show that the use of an MCFC could reduce CO2 emissions by 90% with over 35% efficiency in additional power generation.

Abstract: As major molecules of the basement membrane (BM), laminins are important protein fragments for the epithelial cell adhesion and migration. Since oxidic ceramics are potentially suitable for dental applications, the present paper is focused on the study of laminin interaction with the surface of two alumina-zirconia composites with different percentage in ZrO2, both with submicrometric grain size. Laminin 1 (Ln-1) was adsorbed onto the surface and the interaction was studied via XPS. The cells grown on the laminin-functionalized materials showed good vitality and spreading.