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Afișează articolele 97-116 of 160

    • Rapeseed Oil Flammability on Hot Surface 

      Deleanu, Lorena; Ciocan, Sorin; Șolea, Liviu (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The paper presents the tests and results upon rapeseed oil flammability on hot surface. The oil samples were obtained from a rapeseed oil after a dewaxing process. There were established temperature ranges for which the ...

    • Research about Roughness resulted at Steel Turning and the Correlation with Piece Surability 

      Popescu, Iulian; Pascu, Ileana Cristina (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      For achieving this study the background of the research in correlation domain between roughness and piece durability are used. This paper performs a new research direction about the roughness, considered such volumetric ...

    • Research Issues on Punch - Circular Plate Elastic Contacts 

      Trandafir, Marius; Diaconescu, Emanuel (UDJG, 2010)
      Circular plates enter into the category of finite dimension bodies. Solutions regarding the displacements and stresses, which appear at the contact involving finite dimension bodies and also numerical and analytical results ...

    • Research on Surface Roughness by Laser Cut 

      Radovanovic, Miroslav; Dašić, Predrag (Universitatea ”Dunărea de Jos” din Galați, 2006)
      Laser cutting is one of the most industrial applications. Laser cutting with oxygen is used primarily for cutting of mild and low-alloyed steels. Cut surface quality is a very important characteristic of laser cutting that ...

    • 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 ...

    • Researches of Distribution of Loading on Coils of Running Pair of the Latch 

      Dzhanakhmedov, Akhad Kh. (Universitatea ”Dunărea de Jos” din Galați, 2006)
      This paper gives the calculation procedure of pressure distribution on coils of running pair of latch at various loading schemes. Recommendations are provided for the choice of loading schemes of running pair, which ensure ...

    • 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 ...

    • 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 ...

    • Roughness as Small Surface Defects and Microstructure Changes in the Fatigue Process 

      Mereuță, Valentin; Gheorghieș, Constantin; Palaghian, Liviu (UDJG, 2011)
      Examinations in detail using X-radiation diffraction of the dislocation substructure in fine-grained S355JR steels plate specimen fatigued with constant amplitude were carried out to investigate the correlation between the ...

    • 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 ...

    • 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 ...

    • Simple Approach for Induction Motor Control Using Reconfigurable Hardware 

      Imecs, Maria; Incze I., Ioan; Szabó, Csaba ("Dunarea de Jos" University of Galati, 2002)
      The paper deals with rotor-field-oriented vector control structures for the induction motor drives fed by the so-called tandem frequency converter. It is composed of two different types of DC-link converters connected ...

    • A Simple Device for Modelling Bioarticular Joint Friction 

      Bejinariu, Brîndusa; Diaconescu, Emanuel (UDJG, 2011)
      In this paper a simple device for modelling bioarticular friction is presented. The experimental device serves to simulate the movement as it would take place in a knee joint. Key components of the experimental device are ...

    • Singular Points in an Elastic Half-Plane Containing a Circular Hole, Loaded by a Normal Point Force on the Straight Boundary 

      Alaci, Stelian; Diaconescu, Emanuel; Frunză, Gheorghe (Universitatea "Dunărea de Jos" din Galaţi, 2006)
      These authors published theoretical results upon the stress state induced in an elastic half-plane containing a circular hole by a point force applied on its boundary. The solutions were found in bipolar co-ordinates and ...

    • 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 ...

    • 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 ...

    • Some Experimental Results Concerning the Influence of Surface Coatings on the Wear of Poly-Ether-Etherketone (Peek) Polymeric Gears 

      Petrov, Dimitar; Dearn, Karl; Walton, Doug; Banks, Richard (UDJG, 2011)
      Gears made of general purpose Poly-Ether-Ether-Ketone (PEEK) polymeric material and coated on their flanks with a thin layer of different solid lubricants MoS2, graphite (C), BN and PTFE are tested in relation to wear and ...

    • Some Special Features of the Elastic-Plastic Deformation of the Composite Electrolytic Platings 

      Javgureanu, Vasile; Gordelenco, Pavel; Elita, Natalia (Universitatea ”Dunărea de Jos” din Galați, 2006)
      One brings the elastic particularises and figures of the deformation of composition of the iron-nickel and iron hedging’s to the micropression. This information makes it possible to explain the mechanism elastic and plastic ...

    • Specific Aspects of the Contact Wheel-Rail and the “IN SITU” Rehabilitation of Tram Rails 

      Argeşanu, Veronica; Popescu, Mihaela (Universitatea "Dunărea de Jos" din Galaţi, 2006)
      The rails are an important and critical part of a railway system and are exposed, during service, to high stresses of different types, frequency and orientation and also to different environmental. The tram rails are in ...

    • Statistical Assessment of Surface Quality Using 3D Profilometry Parameters 

      Deleanu, Lorena; Andrei, Gabriel; Ciortan, Sorin; Cantaragiu, Alina; Besnea, Aida; Trufașu, Cătălin; Podaru, Geanina (Universitatea ”Dunărea de Jos” din Galați, 2009)
      he paper presents a statistical analysis for quality assessment of metallic surfaces and coating in order to use the conclusions for improving coating technology. Surface investigation was done with the help of a 3D ...