Căutare 2006 fascicula8 după Titlu

Afișează articolele 4-23 of 24

    • Etablissement de L’angle Maximum de Pivotement pour un Rouleau Cylindrique d’un Roulement a Quatre Epaulements de Guidage 

      Paleu, Viorel; Nelias, Daniel; Antaluca, Dominic; Mevel, Bruno (Universitatea ”Dunărea de Jos” din Galați, 2006)
      In cylindrical roller bearings subjected to complex radial and axial load, there is always a skew motion of rollers. This parasite motion increases the total friction loss within the bearings, restricting their running ...

    • Experimental Studies Concerning Damage of Two Lubricant Greases in Severe Working Conditions 

      Diaconu, Nicolae (Universitatea ”Dunărea de Jos” din Galați, 2006)
      In this paper certain results regarding behavior of two greases used in lubrication of rolling and rolling-sliding tribosystems are presented. For this aim, a specialised stand has been used. The experimental tests were ...

    • Failure of a Total Knee Prosthesis Tibial Tray Due to the Fatigue Wear 

      Capitanu, Lucian; Iarovici, Aron; Onișoru, Justin (Universitatea ”Dunărea de Jos” din Galați, 2006)
      Some studies report the failure of a tibial insert of knee prostheses due to the subsurface cracking and delamination wear [1]. The present study starts by analysing retrieved total knee prosthesis revealing the loss of a ...

    • Hysteresis and Mechanical Fatigue 

      Frunză, Gheorghe; Diaconescu, Emanuel (Universitatea ”Dunărea de Jos” din Galați, 2006)
      The material dumping, known also as inner friction or, simply hysteresis, is considered to be related to energy dissipation in the volume of a macro-continuous medium. This phenomenon takes place when a more or less ...

    • Interaction Between Two Unequal Circular Holes Lying in a Sheared Elastic Plane 

      Alaci, Stelian; Diaconescu, Emanuel; Frunză, Gheorghe (Universitatea "Dunărea de Jos" din Galaţi, 2006)
      The paper presents an analytic solution for the stress states in an elastic plan where two unequal circular holes are lying. At infinity, the elastic plane is sheared. To solve the problem, the authors used bipolar ...

    • Model and Application of the Dispsersional aAnalysis for a Wear Study 

      Bărăscu, Elena (Universitatea "Dunărea de Jos" din Galaţi, 2006)
      This paper shows a coherent calculation model of the unifactorial dispsersional statistic analysis applied for the experimental data study obtained on samples of different volumes, drawn out from a researched statistical ...

    • A New Trend for Preparating Polymeric Calcium Sulfonates for Metal Working Fluids by Phase Transfer Catalysis. Part I. 

      Kaidy, M.Y.El; El-Morsi, A.K; Tantawy, N.; Omar, A.M.A; Tabei, A.S.El (Universitatea ”Dunărea de Jos” din Galați, 2006)
      Calcium sulfonates derived from sulfonation of heavy alkylate and aromatic extract were synthesized and reacted with formalin to produce anionic polymer in the presence of phase transfer catalysts (PTC). These catalysis ...

    • Optimisation of the Tooth Flank Geometry for Non-Standard Spur gear 

      Andrei, Laurentia; Andrei, Gabriel; Walton, Douglas (Universitatea "Dunărea de Jos" din Galaţi, 2006)
      In order to increase the transmissible power level of the plastic spur gears, a non-standard tooth is designed, with a variable geometry along the gear facewidth. The variation of the tooth flank geometry, generated by ...

    • Prediction of Wear of Acetabulum Inserts Due to Multiple Human Routine Activities 

      Onișoru, Justin; Capitanu, Lucian; Iarovici, Aron (Universitatea ”Dunărea de Jos” din Galați, 2006)
      It is difficult to predict the quantitative and qualitative aspects of the wear of the components that allow relative motion due to several factors. First, the prosthetic parts in contact experience a wide spectrum of ...

    • A Preliminary Study on the Dynamics of Triboemission, Work Function and Surface Charging of Ceramics 

      Molina, Gustavo.J (Universitatea ”Dunărea de Jos” din Galați, 2006)
      This paper discusses the tribological dynamics of electron triboemission and after-contact emission during scratching of ceramics. The origin of such triboemission is still unclear, but the author and colleagues consistently ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • The External Cylindrical Surface Rolling by Method of Cold Deformation 

      Ivanovic, Petar; Djordjevic, Ljubodrag; Dašić, Predrag (Universitatea ”Dunărea de Jos” din Galați, 2006)
      This report, by the shown methodology, tries to contribute to the effective solution of tasks in the field of studying and designing the processes and states. It also points out a possible way of achieving high techno-economical ...

    • Tribological Behaviour of CO-CR-MO and Uhmwpe the Components of Intervertebral Disc Prosthesis 

      Iliuță-Crețan, Monica; Munteanu, Florin; Gafițanu, Mihai (Universitatea ”Dunărea de Jos” din Galați, 2006)
      The Intervertebral Disc Prostheses consist of a modular system and his function is based on low intervertebral friction. As a result of friction forces acting to the spine structures, the intervetebral disc prostheses can ...

    • Ultrasound Action on Strength Properties of Polycrystalline Metals 

      Moraru, Luminița (Universitatea ”Dunărea de Jos” din Galați, 2006)
      The mechanical properties of pure aluminum were investigated by tensile test on the sample with average grain size between 60 and 1000 µ m. The stress strain functions given by the models are fitted to the measured points. ...

    • Upon Friction on a Ball Bearing - Outer Raceway Contact - I. Uniform Loading of the Balls 

      Irimescu, Luminița; Diaconescu, Emanuel; Berthier, Yves (Universitatea ”Dunărea de Jos” din Galați, 2006)
      The paper advances an analytical model to evaluate the effect of micro-slip on the friction losses at the interface of a normally loaded rolling contact. The model validation was done by comparing the theoretical results ...

    • Upon Radial Fretting of Dissimilar Materials 

      Ciornei, Florina; Irimescu, Luminița; Diaconescu, Emanuel (Universitatea ”Dunărea de Jos” din Galați, 2006)
      The paper presents a state of the art concerning radial fretting for dissimilar bodies and fretting damage. Four simple fretting models are defined in the literature: tangential, radial, rotational and torsional. Only the ...