Now showing items 6-25 of 35

    • Electrochemical and Mechanical Changes on Fatigue Corrosion Damaged Surfaces 

      Băicean, Svetlana; Palaghian, Liviu; Ciortan, Sorin; Thompson, Mioara (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 ...
    • Experiences in Lubrication of non-Natural Gas Fuelled Stationary Engines 

      Novotny-Farkas, Frantz; Bauman, Karin; Leimeter, Tibor (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 Investigations Concerning the Mathematical Model of Hard Deposits by High-Speed Flame Spraying 

      Petrov, Doina; Antonescu, Niculae Napoleon; Neacșu, Marian (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 Study on Roughness Parameters Variation, During Running – in Period, for a Cylinder-Plane Friction Couple 

      Petrescu, Florin; Davidescu, Anton; Vlase, Monica (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 

      Petrescu, Florin; Davidescu, Anton; Vlase, Monica (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 ...
    • Flammability Test Data in Risk Assessment 

      Deleanu, Lorena; Buzoianu, Dragoș; Crăciunoiu, Ștefan; Rîpă, Minodora; Spânu, Constantin (Universitatea ”Dunărea de Jos” din Galați, 2008)
      This paper reviews the most recent information on standards dealing with testing fire-resistance of hydraulic fluids in order to emphasis the importance of selecting hydraulic fluids including as basic criteria of reducing ...
    • Global Method Using Experimental Data for Characterizing the Lubricants Durability 

      Rădulescu, Alexandru; Rădulescu, Irina; Bălan, Corneliu; Petrescu, Florin; Pogrion Popescu, Nicolette Amelie (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 

      Paleu, Viorel (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 

      Laurian, Tiberiu; Marinca, Lucian; Tudor, Andrei; Pârvu, Felix (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 

      Tala-Ighil, Nacer; Maspeyrot, Patrick; Fillon, Michel; Bounif, Abdelhamid (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 ...
    • Industrial Gear Oils from Renegerable Feed Stocks 

      Tănăsescu, Constantin; Petre, Diana; Bogatu, Liana; Antonescu, Niculae Napoleon (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 Shear Stability on Oils Behaviour 

      Ciortan, Sorin; Rîpă, Minodora; Chiculiță, Simona (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 the Sliding Speed on the Elastohydrodynamic Regime 

      Seiciu, Petre Lucian (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 ...
    • Investigation of Layers Formed Through Selective Transfer with Atomic Force Microscopy 

      Ilie, Filip; Tița, Constantin (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 ...
    • New Test Facility for Fluid Film Journal Bearings 

      Dimofte, Florin; Ene, Nicoleta M. (Universitatea ”Dunărea de Jos” din Galați, 2008)
      This paper describes a new experimental rig to test journal fluid film bearings. It has been operating at the NASA Glenn Research Center (GRC) in Cleveland, Ohio since August 2006. The rig can apply total radial loads of ...
    • Nitrogen Influence on Indentation Fracture Toughness of Stainless Steel Coatings 

      Thompson, Mioara; Palaghian, Liviu (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 ...
    • On Tribological Behaviour of Thermo-Chemical Treated Steels after Thermo-Magnetic Treatments 

      Papadatu, Carmen-Penelopi (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 ...
    • Research Rearding of Composite Materials under the Influence of Abrasive Wear 

      Florea, Carmen; Florea, Alexandru; Chivu, Mioara (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The method described in the paper will allow estimating the composite materials performances with different structures and various working conditions, with a view to estimate useful life of technological equipments parts ...
    • Residual Stresses Effect on Fatigue Life of Rolling Contacts 

      Crețu, Spiridon; Benchea, Marcelin (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The fatigue life tests carried out on two groups of ball bearings point out the positive influence of the compressive residual stresses induced by a previous loading in the elastic-plastic domain. The values of residual ...
    • Seizure of a High-Speed Three-Wave Journal Bearing 

      Buzescu, Daniela; Pascovici, Mircea (Universitatea ”Dunărea de Jos” din Galați, 2008)
      This paper is focused on the geometry and operating parameters of the bearing experimentally studied at NASA Glenn Research Center by F. Dimofte. It presents two simple thermoelastohydrodynamic (TEHD) models for two typical ...