2008 fascicula8: Recent submissions

Afișează articolele 21-35 of 35

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Vegetal Oils as Lubricating Materials 

      Calomir, Camelia; Ștefănescu, Ioan; Chiriță, George (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The success of vegetal oils is related to their biodegradability and reduced toxicity but a wide use is limited by their insufficient stability in time. Biodegradable oils have ecological advantages, being comparable or ...

    • 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 ...

    • 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 ...

    • Behaviour of a Hydrodynamic Journal Bearing: Torque Measurement During Start-Up 

      Bouyer, Jean; Fillon, Michel (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The start-up friction coefficient in hydrodynamic bearings, used by engineers in the design of bearings, is most often issued from an approximation. Several studies can be found in the literature on this topic but most of ...

    • 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 ...

    • Analysis of Gear Quality Criteria and Performance of Curved Face width Spur Gears 

      Andrei, Laurentia; Andrei, Gabriel; Walton, Douglas; Dearn, Karl (Universitatea ”Dunărea de Jos” din Galați, 2008)
      For plastic gears, developments in composites and tooth geometry are essential for their selection in power transmissions. In order to enhance the transmissible power level of the plastic spur gears, an arc-shaped tooth ...