Căutare după Autor "Ștefănescu, Ioan"

Afișează articolele 1-7 of 7

    • An Isothermal Model for Evaluating Stress and Strain in the Polymeric Block of the Block-on-Ring System 

      Georgescu, Constantin; Boazu, Doina; Ștefănescu, Ioan; Deleanu, Lorena (Universitatea "Dunărea de Jos" din Galați, 2012)
      This paper presents the results of simulating an isothermal frictional contact between a polymeric block and a steel ring. The model takes into account the elasto-plastic behavior of the polymeric materials and the ...

    • Aspects of Rheological Behavior of Rapeseed Oil 

      Șolea, Liviu; Ștefănescu, Ioan; Chiriță, George (Universitatea ”Dunărea de Jos” din Galați, 2009)
      This paper presents a study of dynamic viscosity variation with shear rate for rapeseed oils obtained from different stages of processing and the hydraulic oil grade H32. For each of the 6 types of oils studied was determined ...

    • Diffractometry Analysis on Non-Conventional Treated Steels after Tribological Tests 

      Papadatu, Carmen-Penelopi; Gheorghieș, Constantin; Ștefănescu, Ioan (Universitatea ”Dunărea de Jos” din Galați, 2009)
      Two steel grades were subjected to a nitro-carburized thermo-chemical treatment after thermo-magnetic treatments. The contact was studied employing the concept of tribosystem and tribomodel. The structural aspects into ...

    • Ecological Lubricants Based on Vegetal Oils 

      Ștefănescu, Ioan; Șolea, Liviu; Chiriță, George (UDJG, 2011)
      Recently, there is an ecologically justified tendency to use lubricants based on vegetal oils and synthetic fluids, both ones reducing the application field of mineral oils. Biodegradable lubricants will be more used in ...

    • Mechanical Resistance as a Function of Local Properties 

      Chiriță, George; Ștefănescu, Ioan; Soares, Delfim; Silva, Filipe (Universitatea "Dunărea de Jos" din Galați, 2007)
      The present study makes an estimation of an automotive engine piston mechanical properties and fatigue life based on some characteristics of metallurgical microstructure. Because it is intended to assess the properties ...

    • 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 ...

    • 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 ...