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    ABSTRACT: The present work describes a theoretical study to demonstrate the effect of the journal misalignment on the performance of an orifice compensated hole-entry hybrid journal bearing system lubricated with ER fluid. The journal misalignment has been accounted for by defining a pair of misalignment parameters sigma and delta. Continuous Bingham Model has been used to describe the behavior of ER fluid. The bearing static and dynamic characteristic parameters presented in the study indicate that the effect of journal misalignment is in general to cause a reduction in bearing dynamic characteristic parameters whereas the electric field in the ER fluid is to partially compensate this loss.
    Tribology International 05/2010; 43(5-6-43):1059-1064. DOI:10.1016/j.triboint.2009.12.052
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    ABSTRACT: In the present experimental investigation, Al (12 wt% Si) as matrix material and up to 15 wt% of flyash particulate composite was fabricated using the liquid metallurgy route. The wear and friction characteristics of the composite in the as-cast conditions were studied by conducting sliding wear test, slurry erosive wear test and fog corrosion test. The sliding wear behavior of the MMCs were investigated by varying parameters like normal load, percentage flyash, and track velocity. Pin-on-disc wear testing machine was used for investigating sliding wear behavior. In slurry erosive wear studies, percentage flyash and pH value of the slurry were used as variables. Corrosion studies were carried out using fog corrosion test. The specimens were exposed to a fog of NaCl. The worn surfaces were analyzed using optical microscope and scanning electron microscope. The results indicate that the wear resistance of the flyash reinforced material increased with increase in flyash content, but decreases with increase in normal load, and track velocity. The microscopic examination of the worn surfaces, wear debris and subsurface shows that the base alloy wears primarily because of micro cutting. But the MMCs wear because of delamination, micro cutting, oxidation and thermal softening. Corrosion has increased with increase in flyash content.
    Wear 05/2007; 262(11-12-262):1450-1462. DOI:10.1016/j.wear.2007.01.026
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    ABSTRACT: Solidification of molten metals during various casting methods poses many practical problems associated with phase transformation and heat transfer processes. Evaluation of solidification time is one of the very important parameters used for assessing the properties of the material. In the present study, an experimental investigation was carried out to measure the solidification time in a cylindrical hollow casting cast in CO2-sand moulds and the same has been compared with computed results obtained using an implicit alternating direction (IAD) method, including the treatment of interfacial nodes between metal and mould, and boundary nodes at the mould surface. Aluminium-4.5% Cu alloy was used. Computed cooling curves at various locations and temperature distributions in core-metal-mould were presented. The results show that the solidification time obtained in the experimental study compares well with that predicted by the analysis made through IAD modelling. A successful comparison with reported experimental results shows that the technique is appropriate for simulation of the solidification process of aluminium castings.
    Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture 07/2006; 220(7):1117-1129. DOI:10.1243/09544054JEM286
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    ABSTRACT: In this study, an aluminium based metal matrix was reinforced with silicon carbide (SiC) particulates using the conventional vortex casting technique. Macro-and microstructural studies conducted on the samples revealed a near uniform distribution of SiC particulates. Sliding wear, slurry erosive wear, and corrosive wear of the as-cast metal matrix composite (MMC) were studied. It was found that sliding wear and slurry erosive wear resistance improved considerably with the addition of SiC particles, whereas corrosion resistance decreased. Microscopic examinations of the worn surfaces, wear debris, and subsur-face show that the base alloy wears primarily due to micro-cutting. MMCs wear, however, because of micro-cutting, oxidation, plastic deformation, and thermal softening. In slurry erosive wear, the formation of a passive layer retarded the wear of the material. It was observed that pitting corrosion was the domi-nant mechanism. The bulk hardness increased with an increase in the percentage of SiC particulates. There was not much change in the density of MMCs compared to the base metal.
    MATERIALS SCIENCE-POLAND 01/2006; 24(2).
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    ABSTRACT: Aluminium based metal matrix composite containing 5, 10, and 15% by weight of flyash particulates was successfully synthesised using a stir cast method. The microstructure of these stir cast composites exhibited relatively uniform distribution of flyash particles. Mechanical properties such as density, hardness, and tensile strength were investigated. Sliding wear behaviour, slurry erosive wear behaviour, and fog corrosion behaviour of the composite were also investigated in the heat treated condition. The results of wear studies have shown that the resistance to wear increases with increasing percentage of flyash particulates. The addition of flyash particles showed appreciable change in overall density values. The bulk hardness and tensile strength increased with increasing flyash content. The presence of flyash particles appeared to initiate pitting corrosion.
    Materials Science and Technology 10/2005; 21(11):1337-1343. DOI:10.1179/174328405X69533
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    ABSTRACT: In the present investigation, Aluminium based metal matrix composite containing up to 15% weight percentage of flyash particulates were successfully synthesized using vortex method. The properties like density, hardness, microhardness, ductility and ultimate tensile strength were investigated. The MMC produced was also subjected to corrosion, dry sliding wear and slurry erosive wear test to investigate its behavior under different material wearing conditions. The results of microhardness revealed higher hardness of the matrix material in the immediate vicinity of flyash particle. The addition of flyash particles reduces the density of composite while increasing some of their mechanical properties. The results of wear studies have shown that the resistance to wear increases with increase in percentage of flyash. Corrosion resistance decreases with increase in flyash content. The macrostructural and microstructural characteristics of the MMC were investigated with particular emphasis on the distribution of flyash particles in the matrix. Macrostructural studies have shown near uniform distribution of flyash particles in matrix. Analysis of fractured surface of tensile test specimen is also made which revealed brittle fracture behavior of MMCs.
    Journal of Materials Science 10/2005; 40(22):5989-5997. DOI:10.1007/s10853-005-1303-6
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    ABSTRACT: This paper deals with theoretical and experimental investigations on the free vibration characteristics of representative large flexible solar array appendages used in spacecrafts under vacuum environmental conditions prevailing in space. Eight different configurations of solar panels with varied flexibility and surface area have been studied. The theoretical results, namely the modal parameters, have been correlated with results from experiments. These are performed on solar arrays of different configurations under varied parameters of panel flexibility, vacuum and amplitudes of vibration.RésuméCet article traite de l'étude théorique et expérimentale des caractéristiques des vibrations libres d'accessoires de grande dimension utilisés pour retenir des panneaux solaires aux satellites, dans les conditions de vide rencontrées dans l'espace. Huit configurations ayant des flexibilités et des dimensions différentes furent étudiées. Les résultats théoriques, en particulier les modes de vibrations, furent confrontés aux résultats expérimentaux. Ces essais furent réalisés sous différentes conditions de vide et d'amplitude de vibration. La flexibilité des panneuax était aussi un des paramètres d'essais.
    Mechanism and Machine Theory 01/1989; 24(6):481-492. DOI:10.1016/0094-114X(89)90004-9
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    ABSTRACT: In the present investigation, Aluminium based metal matrix composite containing up to 15% weight percentage of Silicon carbide particles are synthesized using stir-cast method. Macrostructural studies have shown near uniform distribution of SiC particulates in the longitudinal direction. Microstructure also showed uniform distribution along the cross section of the specimen. Friction and wear behavior is studied by using computerized pin on disc wear testing machine. Resistance to wear has increased with increase in silicon carbide particles. But wear has increased with increase in normal load and sliding velocity. Hardness has increased with increase in SiC particles.
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