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Afișează articolele 27-46 of 160
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Ecological Lubricants Based on Vegetal Oils
(UDJG, 2011)Recently, there is an ecologically justified tendency to use lubricants based on vegetal oils and synthetic fluids, both ones reducing the application field of mineral oils. Biodegradable lubricants will be more used in ... -
Elastic Frictional Contact under Normal and Tangential Loading
(UDJG, 2011)A robust algorithm for elastic contact simulation considering tangential tractions is advanced in this paper. Two similar numerical models are advanced for the normal, as well as for the tangential direction, and the ... -
Elastic-Plastic Contact Modeling. Part I: Algorithm Overview and Assessment of Plastic Strain Increment
(UDJG, 2010)A fast algorithm for elastic-plastic contact simulation is overviewed in this paper. Betti’s reciprocal theorem is employed to assess surface normal displacement and stress state in an elastic half-space in the presence ... -
Elastic-Plastic Contact Modeling. Part II: Numerical Simulations and Program Validation
(UDJG, 2010)Elastic plastic spherical contact is simulated using an algorithm proposed in a companion paper. Materials of contacting bodies are assumed to have different behaviours: rigid (R), elastic (E), elastic-plastic with isotropic ... -
Electrochemical and Mechanical Changes on Fatigue Corrosion Damaged Surfaces
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents some surfaces changes aspects in fatigue corrosion damage based on electrochemical, mechanical profilometry and microscopically analyze of cylindrical and plate steel specimens. The researches have ... -
Estimation of the Operability Index of a Containership Operating in the Black Sea
(Universitatea ”Dunărea de Jos” din Galați, 2009)The calculation of the operability index, which represents the percentage of time during which the ship is operational, depends on the wave climate of the ocean area where the ship operates, the dynamic response of the ... -
Etablissement de L’angle Maximum de Pivotement pour un Rouleau Cylindrique d’un Roulement a Quatre Epaulements de Guidage
(Universitatea ”Dunărea de Jos” din Galați, 2006)In cylindrical roller bearings subjected to complex radial and axial load, there is always a skew motion of rollers. This parasite motion increases the total friction loss within the bearings, restricting their running ... -
Experiences in Lubrication of non-Natural Gas Fuelled Stationary Engines
(Universitatea ”Dunărea de Jos” din Galați, 2008)In Europe, a huge number of generators for electric power, powered by those stationary engines are becoming increasingly popular in regions where these renewable fuel sources are available. Nevertheless, the continuously ... -
Experimental Determination of Contact Area Between a Sphere and a Circular Plate Using a Technique Based on Laser Profilometry
(UDJG, 2011)This paper presents the experimental determination of contact area between a steel sphere and a sapphire circular plate, using a technique based on laser profilometry. The reflectivity value is smaller inside contact area ... -
Experimental Investigations Concerning the Mathematical Model of Hard Deposits by High-Speed Flame Spraying
(Universitatea ”Dunărea de Jos” din Galați, 2008)A complex study was done by the paper’s authors using some independent models that take into account the combustion process, the particles’ dynamics, the fluid dynamics and also the particle fluid transfer processes when ... -
Experimental Preliminary Research Regarding Normally and Tangentially Loaded Contacts
(UDJG, 2011)The purpose of this paper is to determine the contact area for a contact between a steel sphere and a sapphire disk loaded normally and tangentially, using laser profilometry. For this, was used an experimental device ... -
Experimental Research for Measuring Friction Forces from Rod Sealing at the Hydraulic Cylinders
(UDJG, 2010)The paper presents experimental equipment and research results conducted by Hydraulics and Pneumatics Research Institute INOE 2000-IHP Romania in cooperation with Institute PPRIME – University of Poitiers France, in order ... -
Experimental Studies Concerning Damage of Two Lubricant Greases in Severe Working Conditions
(Universitatea ”Dunărea de Jos” din Galați, 2006)In this paper certain results regarding behavior of two greases used in lubrication of rolling and rolling-sliding tribosystems are presented. For this aim, a specialised stand has been used. The experimental tests were ... -
Experimental Study of Friction Losses in Ball Screws
(Universitatea ”Dunărea de Jos” din Galați, 2009)In contrast with conventional sliding lead screws, ball screws with rolling friction between the screw and nut have high efficiency, accurate positioning and smooth, quiet operation at low friction that make this kind of ... -
Experimental Study on Roughness Parameters Variation, During Running – in Period, for a Cylinder-Plane Friction Couple
(Universitatea ”Dunărea de Jos” din Galați, 2008)The studies of various lubrication problems have been recently focused on atypical geometrical and operating conditions (extreme conditions). Among these cases, one can find analyses of HD bearings having surface macroscopic ... -
Experimental Study on Roughness Parameters Variation, During Running – in Period, for a Cylinder-Plane Friction Couple
(2008)The studies of various lubrication problems have been recently focused on atypical geometrical and operating conditions (extreme conditions). Among these cases, one can find analyses of HD bearings having surface macroscopic ... -
Experimental Validation of a New Dispersion Method of Additive Particles into Polymer Matrix Composites
(Universitatea ”Dunărea de Jos” din Galați, 2009)The general expected properties of the composite materials are the result of the efficient reinforcement distribution of nanometric particles, one of the most important methods considers their dispersion. The aim of this ... -
Fabric Reinforced Filled Epoxy Composites
(Universitatea ”Dunărea de Jos” din Galați, 2009)Among composites, the polymer matrix ones are the cheapest and the easiest to form but they show major disadvantages such as poor electrical and thermal conductivity, low fire resistance etc. In the case of any composite, ... -
Failure of a Total Knee Prosthesis Tibial Tray Due to the Fatigue Wear
(Universitatea ”Dunărea de Jos” din Galați, 2006)Some studies report the failure of a tibial insert of knee prostheses due to the subsurface cracking and delamination wear [1]. The present study starts by analysing retrieved total knee prosthesis revealing the loss of a ... -
A Fast Numerical Method to Predict Elastic Fields Due to Eigenstrains in an Isotropic Half-Space PartII. Program Validation and Simulations
(Universitatea ”Dunărea de Jos” din Galați, 2009)A fast algorithm to solve the inclusion problem for arbitrarily shaped eigenstrains is validated in this paper. Influence coefficients formulas and numerical predictions for elastic fields due to a spherical region of ...