Căutare Fascicula VIII după Data publicării

Afișează articolele 21-40 of 160

    • 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 ...

    • 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 ...

    • 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 ...

    • Bending of Thin Walled Pipes Using the Heat Realised by Friction 

      Tadic, Branko; Marjanovic, Nenad; Nedic, Bogdan (Universitatea ”Dunărea de Jos” din Galați, 2006)
      This paper considers appliance of heat generated by friction to relieve deformation of light metals, having as example of bending thin walled copper pipes. Based on numerous, primarily experiment analysis the conclusions ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Damage Evolution of AL7175 and CK45 Alloys under Fretting Fatigue 

      Buciumeanu, Mihaela; Miranda, Antonio Sousa; Silva, Filipe Samuel (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      There are several different parameters that affect the fretting fatigue behaviour of materials. The present work is focused on the influence of the wear damage evolution. Results of fretting fatigue experimental tests ...

    • Wear Prediction of Hip Endoprostheses 

      Căpitanu, Lucian; Onişoru, Justin; Iarovici, Aron (2007)
      The total hip prostheses can be considered as medical-mechanical devices with established failure. The large domain of common activities induces a wide spectrum of loadings in contact prosthetic parts. The contact conditions ...

    • Mechanical Resistance as a Function of Local Properties 

      Chiriţă, George; Ştefănescu, Ioan; Soares, Delfim; Silva, Filipe Samuel (Universitatea "Dunărea de Jos" din Galaţi, 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 in ...

    • Flammability Tests on Hot Surfaces for Industrial Fluids 

      Deleanu, Lorena; Buzoianu, Dragoş; Rîpă, Minodora; Crăciunoiu, Ştefan; Drug, Adina (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      Industrial fluids have to be evaluated not only for their performances as load capacity, durability, but also for their potential risk including ignition. Based on a solid documentation the authors point out the significance ...

    • Structured Surfaces used for Improving Tribological Behaviour for the Piston – Ring Cylinder – Liner Friction Couples in Internal Combustion Engines 

      Mihalcea, Gabriel Arin; Mihăescu, Leonard (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      Structured surfaces means the achievement of a rate, or controlled micro-geometry for one or both friction surfaces. These surface profiles are used to guarantee lubrication functions of transport, hoarding and spread of ...

    • On Kerosene Lubrication of Hybrid Ball Bearings 

      Paleu, Viorel; Nelias, Daniel (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      The hybrid ball bearings with silicon nitride balls are employed in special applications, e.g. high-speed machine tools and aeronautics. The kerosene can be used not only as a fuel for the jet engine, but also as lubricant ...

    • 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 ...

    • The Resulted Roughness at Turning of some Non-Metallic Materials and Correlation with Durability of Machine Cut Surfaces 

      Pascu, Ileana Cristina; Popescu, Iulian (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      In this paper there are studied the results obtained at graphite and polyvinyl chloride turning. Such pieces are used like loose parts or in subassemblies. The final roughness of such pieces after processing and the influence ...

    • Influence of Grease Grade and Working Regime on the Structural Modifications of the Superficial Layers on Roller-Roller Tribosystems 

      Diaconu, Nicolae (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      A X-ray diffractometric method is used for analysing the distributions of the 1-st and 2-nd tension state and dislocation density in the superficial layers, after tests in different working and lubricating conditions, the ...

    • 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 ...

    • A Study on the Prediction of Stability Behaviour for Flexible Rotor in Journal Bearings 

      Ciortan, Sorin; Ruggiero, Alessandro; Senatore, Adolfo; Palade, Vasile (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      The influence of the labyrinth seals on the dynamic behaviour of a flexible rotor in journal bearings is investigated. In particular a code which makes possible the determination of the stiffness and damping coefficients ...

    • The Level of Confidence for a Ship Hull Girder 

      Popoiu Păcuraru, Sandiţa; Matulea, Iordan (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      Structural estimation consists in a set of activities done to certificate security and reliability of an existing ship for its residual service life. Depending on ship’s type and damages, there are alternatively evaluation ...

    • 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 ...