Căutare Fascicula VIII după Titlu
Afișează articolele 52-71 of 160
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Global Method Using Experimental Data for Characterizing the Lubricants Durability
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents a global method for characterizing the durability of lubricants, in order to establish the moment of changing, using objectives criteria. Three types of lubricants, for essence and Diesel engine, have ... -
High-Speed Hybrid Angular Contact Ball Bearings Lubricated by Kerosene Mist
(Universitatea ”Dunărea de Jos” din Galați, 2008)This paper presents some experimental research, carried-out on 7206C hybrid angular contact ball bearings lubricated by oil and kerosene mist. The monitored parameters are the friction moment of the testing bearing, and ... -
Hip Joint Contact Pressure Distribution Pand After Triple Osteotomy
(Universitatea ”Dunărea de Jos” din Galați, 2008)A 3−D reconstruction method based on CT scans was used to compute the femoral head coverage for dysplasic hips prior and after reconstruction surgery. The triple osteotomy technique was used to “reorient” the acetabulum ... -
Hydrodynamic Effects of Texture Geometries on Journal Bearing Surfaces
(Universitatea ”Dunărea de Jos” din Galați, 2008)Lately, the expanding range of tribological applications to the microscopic levels has revived interest in this field. Actually, little is understood about the subtle effects of variations of a journal bearing’s profile ... -
Hydrogen Wear of the Slab Continuous Casting Guiding Tribosystems
(UDJG, 2011)The steel continuous casting equipment consists of a set of technical systems which, tribologically, may be regarded as tribological systems. The process model contains input –output, command and control parameters. Both ... -
Hysteresis and Mechanical Fatigue
(Universitatea ”Dunărea de Jos” din Galați, 2006)The material dumping, known also as inner friction or, simply hysteresis, is considered to be related to energy dissipation in the volume of a macro-continuous medium. This phenomenon takes place when a more or less ... -
Industrial Gear Oils from Renegerable Feed Stocks
(Universitatea ”Dunărea de Jos” din Galați, 2008)The aim of this research study is to obtain industrial gear oils. The formulation of this type of lubricant is based on vegetable oils or mixtures of vegetable oils with more stable base oils and appropriate additives. The ... -
Influence of Grease Grade and Working Regime on the Structural Modifications of the Superficial Layers on Roller-Roller Tribosystems
(Universitatea "Dunărea de Jos" din Galaţi, 2007)A X-ray diffractometric method is used for analysing the distributions of the 1-st and 2-nd tension state and dislocation density in the superficial layers, after tests in different working and lubricating conditions, the ... -
Influence of Shear Stability on Oils Behaviour
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents a method to establish a link between the shear stability index and service behaviour of motor oils. A standardized method for shearing stability establishing is combined with appropriated curve fitting ... -
Influence of Sliding Speed and Average Pressure in Dry Regim Upon Wear of Composite with PA and Micro Glass Spheres
(Universitatea ”Dunărea de Jos” din Galați, 2009)The papers presents the wear results of testing a set of composites PA + 1% black carbon + x% micro glass spheres, where x is the micro glass sphere concentration (x=0, 5, 10, 20, 30wt) using a pin-on-disc tribotester, for ... -
Influence of the Sliding Speed on the Elastohydrodynamic Regime
(Universitatea ”Dunărea de Jos” din Galați, 2008)The study of the elastohydrodynamic (EHD) lubrication regime is characterristic for the heavily loaded gears and can be modeled on a two disk (SAE) rig. It is very important to observe and determine the lubrication regime ... -
Interaction Between Two Unequal Circular Holes Lying in a Sheared Elastic Plane
(Universitatea "Dunărea de Jos" din Galaţi, 2006)The paper presents an analytic solution for the stress states in an elastic plan where two unequal circular holes are lying. At infinity, the elastic plane is sheared. To solve the problem, the authors used bipolar ... -
Investigation of Layers Formed Through Selective Transfer with Atomic Force Microscopy
(Universitatea ”Dunărea de Jos” din Galați, 2008)Atomic force microscopy (AFM) has become a versatile tool for investigating local mechanical properties. In addition, through the AFM tip-couple interaction, it is possible to study the effects of perturbations and ... -
Kinematic and Dynamic Aspects of Damped Collision Between Two Metallic Balls
(UDJG, 2011)Recently, a new model of the behaviour of a collision has been proposed by Flores. The model describes the behaviour during the impact of a complete range of metallic materials, from the soft to the hard ones. The present ... -
Measuring the Residual Stress of the Injection Moulded Polymeric Parts
(Universitatea ”Dunărea de Jos” din Galați, 2009)The residual stresses are usually introduced during manufacturing, and are caused by processes such as molding. This paper presents how the authors determine the residual stresses for the flat plates from ABS, PP and PS ... -
Mechanical Resistance as a Function of Local Properties
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The present study makes an estimation of an automotive engine piston mechanical properties and fatigue life based on some characteristics of metallurgical microstructure. Because it is intended to assess the properties in ... -
A Method to Evaluate the Durability of Sucker Rod Pumps and to Reduce Corrosive Wear
(UDJG, 2011)The paper presents experimental tests made in static and dynamic conditions in order to establish the wear laws for different materials’ couples at different medium temperatures and pressures. Some complex wear laws were ... -
Microdefects Analysis of Dental Contact Surfaces
(UDJG, 2010)The tribological processes influence the behaviour of the biocontacts between biological bodies, between biomaterials or between biological bodies and biomaterials. Whether natural or artificial, any biocontact is the locus ... -
Model and Application of the Dispsersional aAnalysis for a Wear Study
(Universitatea "Dunărea de Jos" din Galaţi, 2006)This paper shows a coherent calculation model of the unifactorial dispsersional statistic analysis applied for the experimental data study obtained on samples of different volumes, drawn out from a researched statistical ... -
Modelling of Some Degradation Processes by Corrosion Fatigue of Metallic Surfaces
(UDJG, 2011)Based on the well known fatigue corrosion effects, the mechanical stress and the corrosive environment have a significant effect on the prediction of the lifespan of the equipments that work in corrosive environment, two ...
