2008 fascicula8
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@ Universitatea "Dunărea de Jos" din Galați - Facultatea de Inginerie
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The Effect of Wiberg Angle on the Contact Pressure Pistribution in Natural and Artficial Joint
(Universitatea ”Dunărea de Jos” din Galați, 2008)The analogies and differences between the mechanical joints and the biological ones, in the presence of relative motion, are based on the pressure distribution. The paper analysed a numerical model of the pressure distribution ... -
Nitrogen Influence on Indentation Fracture Toughness of Stainless Steel Coatings
(Universitatea ”Dunărea de Jos” din Galați, 2008)This paper studies some aspects of coatings fracture theory and the possibility of extending Lawn’s equation from Vickers indenter geometry to the Rockwell one. Indentation tests were performed on stainless steel coatings ... -
The Influence of the Applied Load on the Friction Coefficient of the Sintered Iron-Base Bearings
(Universitatea ”Dunărea de Jos” din Galați, 2008)In the recent years the iron base sintered bearings production was considerable increased at the expense of the copper based ones, due to the low cost and availability of the iron powders as well as the higher strength. ... -
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 ... -
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 ... -
The Tool to Model through Micro Strain and Micro Cutting
(Universitatea ”Dunărea de Jos” din Galați, 2008)The cutter wear is analised by a single hard fixed particle (inclusion) in brittle material. The shakedown pressure of the inclusion contact is directly proportional to shear field stress of the cutter surface and is ... -
Characterizing the Wear Particles of Intervertebral Disc Prosthesis and their Biological Response
(Universitatea ”Dunărea de Jos” din Galați, 2008)Prosthetic debris is the leading factor causing prosthetic loosening and requiring revision surgery. Wear debris is formed over time with any prosthesis. Factors determining disc arthroplasty survivability are similar to ... -
Study of Wear Evolution for a Hydraulic Oil Using a Four Ball Tester
(Universitatea ”Dunărea de Jos” din Galați, 2008)Time is crucial for the wear of materials. Time of an experiment must be long enough to obtain an observable wear but no so long to make the experiments expensive. For determining anti-wear properties of the hydraulic oils ... -
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 ... -
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 ... -
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 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 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 ... -
On Tribological Behaviour of Thermo-Chemical Treated Steels after Thermo-Magnetic Treatments
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents an analysis on two grades of steel, subjected to nitrocarburized or nitrided thermo-chemical treatment after different thermomagnetic treatments. Based on the concept of tribosystem, pairs of steel rollers ... -
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 ... -
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 ... -
Test-Rig for Pressure Measurements in an Aerostatic Bearing
(Universitatea ”Dunărea de Jos” din Galați, 2008)The paper presents a test rig for local pressure investigation in an aerostatic or gasostatic bearing system. Using a simple and performant computer assisted measurement device, pressure evolution in lubrication area can ... -
Some Aspects about Driving Wheel/Rail Contact in Steady State Interaction
(Universitatea ”Dunărea de Jos” din Galați, 2008)The driving wheel/rail steady state interaction and the response to harmonic excitation were studied using a complex model for track. The starting point for numerical simulations is the Green matrix of the track. The ... -
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 ... -
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 ...
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