Căutare 2008 fascicula8 după Data publicării

Afișează articolele 1-20 of 35

    • 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 ...

    • Viscosity of Amorphous Molecular Substances 

      Diaconescu, Emanuel; Zegrean, Vlad Flaviu; Onciul Miron, Oana (Universitatea ”Dunărea de Jos” din Galați, 2008)
      Because the great majority of flow units in a liquid behave instantaneously in a solid-like manner, rheological properties of molecular liquids subjected to high pressures may be measured by using corresponding molecular ...

    • Dynamics of Hip Artificial Joints Wear 

      Căpitanu, Lucian; Iarovici, Aron; Onișoru, Justin; Țigăneșteanu, Constantin; Dima, Marius (Universitatea ”Dunărea de Jos” din Galați, 2008)
      In the present paper the authors try to evaluate, based on the results obtained from experimental and numerical previous studies, the wear evolution in the components of a Total Hip Prosthesis (THP), during the service ...

    • Contact Model for a Rough Surface 

      Cănănău, Sorin (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The paper presents a model for the determination of the contact characteristics, pressure distribution and subsurface stress field at the contact cylinder- plane. The first part of the paper presents the geometrical models ...

    • 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 ...

    • Shear Stability as Oils’ Performance Indicator 

      Ciortan, Sorin; Rîpă, Minodora; Chiculiță, Simona; Spânu, Constantin (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The paper presents a comparative analysis between the shear stability tests results and four ball tests results for some industrial oils. This correlation is used for establishing the way how the mechanical solicitations ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Some Aspects about Driving Wheel/Rail Contact in Steady State Interaction 

      Mazilu, Traian (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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Test-Rig for Pressure Measurements in an Aerostatic Bearing 

      Muscă, Ilie (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 ...

    • 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 ...

    • Wear Behaviour of the AL7175 Alloy under Different Bulk Stress States 

      Buciumeanu, Mihaela; Miranda, A.S; Silva, F.S (Universitatea ”Dunărea de Jos” din Galați, 2008)
      In what concerns the stresses involved in the process, most wear tests (namely those in the pin on disc and the pin on plate configurations) are usually solely concerned with the stress state in the contact originated by ...