Căutare Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați după Autor "Spânu, Constantin"

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    • A Comparation of Standardized Methods for Lubrication Failure Determination 

      Spânu, Constantin; Rîpă, Minodora; Ştefănescu, Ioan; Deleanu, Lorena (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      Lubricants are used to prevent wear between moving parts and to resist to high pressure between them. There are standardized testing methods that determinate the wear of the contact pair pieces and the pressure that leads ...

    • Diagniosis of the Technical State of Complex Mechanical Systems 

      Crudu, Ion; Spânu, Constantin; Rîpă, Minodora; Teletin, Claudiu (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      The paper presents a model for prediction and diagnosis of technical state of complex mechanical systems based on the systems theory. In diagnosis studies is used a model that has only input and output parameters as a ...

    • 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 ...

    • Hydrogen Wear of the Slab Continuous Casting Guiding Tribosystems 

      Crudu, Ion; Teletin, Claudiu; Spânu, Constantin; Bendrea, Consta; Șarpe, Adrain; Sandu, Alin (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 ...

    • On Viscosity Variation with Temperature of Rapeseed Oil After Different Processing Stages 

      Ștefănescu, Ioan; Șolea, Liviu; Zgherea, Gheorghe; Chiriță, George; Spânu, Constantin (Universitatea ”Dunărea de Jos” din Galați, 2009)
      In recent years, vegetal oils are carefully studied as they may constitute a category of basic raw materials for obtaining organic biodegradable lubricants. Rapeseed oil is seen as an alternative of mineral and synthetic ...

    • Researches on the Presence of Hydrogen During Continuous Casting of Steel 

      Teletin, Claudiu; Crudu, Ion; Spânu, Constantin (Universitatea ”Dunărea de Jos” din Galați, 2009)
      Due to the negative effects that hydrogen has on steels, its content in steels has lately been given special attention. The paper presents the evolution of hydrogen content in steel during the manufacturing and continuous ...

    • 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 ...

    • Sliding Indentation Behaviour of x 65 Hydrogenated Steel Grade 

      Spânu, Constantin; Teletin, Claudiu; Crudu, Ion; Mereuță, Valentin (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The paper presents an experimental research on non-hydrogenated and hydrogenated X 65 steel samples. The steel was obtained from a continuous casting slab, this grade being used in petroleum industry. The hydrogen has an ...

    • Study of Wear Evolution for a Hydraulic Oil Using a Four Ball Tester 

      Spânu, Constantin; Rîpă, Minodora; Ciortan, Sorin (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 ...

    • The Presence of Hydrogen as Wear Environment for the Mechanical System of the Continuous Casting Equipment 

      Teletin, Claudiu; Spânu, Constantin; Crudu, Ion (UDJG, 2010)
      In the last years the continuous casting of the steel has a tremendous development. In the same time, the casting steel quality requirements become higher. The hydrogen as environment of the casting diminishes the steel ...