Căutare Fascicula VIII după Titlu

Afișează articolele 8-27 of 160

    • Behaviour of a Hydrodynamic Journal Bearing: Torque Measurement During Start-Up 

      Bouyer, Jean; Fillon, Michel (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The start-up friction coefficient in hydrodynamic bearings, used by engineers in the design of bearings, is most often issued from an approximation. Several studies can be found in the literature on this topic but most of ...

    • 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 ...

    • Calculul și construcția schimbătoarelor de căldură frigorifice 

      Iosifescu, Cristian Constantin (Galati University Press, 2018)

    • Characterisation of Particulate Epoxy Composites 

      Bîrsan, Iulian-Gabriel; Bria, Vasile; Cîrciumaru, Adrian; Roman, Igor (Universitatea ”Dunărea de Jos” din Galați, 2009)
      Among composites, the polymer matrix ones are the cheapest and the easiest to form but they show major disadvantages such as poor electrical and thermal conductivity, low fire resistance etc. In the case of any composite, ...

    • Characteristics of Material in Zone of Cut by Laser Cutting 

      Radovanovic, Miroslav (UDJG, 2010)
      The laser cutting is a cost effective technology. This process is based on melting and evaporating material in very small, a well-defined area and a blownout of the cut by the assist gas. Laser cutting processes make heat ...

    • Characterization of Materials Surface by X-Ray Reflectivity Measurements 

      Gheorghieș, Constantin; Gheorghieș, Livia; Atanasiu, Valeriu (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The mechanical or physical properties of surface determine a certain behaviour of material in various working conditions. For example, the roughness of surface influences the value of friction coefficient. X-ray reflectivity ...

    • Characterizing the Wear Particles of Intervertebral Disc Prosthesis and their Biological Response 

      Crețan Stamate, Monica; Gafițanu, Mihai; Stamate, Ciprian (Universitatea ”Dunărea de Jos” din Galați, 2008)
      Prosthetic debris is the leading factor causing prosthetic loosening and requiring revision surgery. Wear debris is formed over time with any prosthesis. Factors determining disc arthroplasty survivability are similar to ...

    • Clay/Epoxy Composites 

      Cîrciumaru, Adrian; Bîrsan, Iulian-Gabriel; Bria, Vasile; Postolache, Ion (Universitatea ”Dunărea de Jos” din Galați, 2009)
      Fillers are generally used to decrease the costs of a composite material but they are changing also some of composite’s properties due to their physical properties, their dimensions and their shapes. Filled polymer could ...

    • 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 ...

    • Contact Model for a Rough Surface 

      Cănănău, Sorin (Universitatea ”Dunărea de Jos” din Galați, 2008)
      The paper presents a model for the determination of the contact characteristics, pressure distribution and subsurface stress field at the contact cylinder- plane. The first part of the paper presents the geometrical models ...

    • Criterion of Transition in the Fretting Phenomenon Based on the Variabile Coefficient of Friction 

      Ghimiși, Ștefan Sorinel (Universitatea ”Dunărea de Jos” din Galați, 2006)
      Fretting is now fully identified as a small amplitude oscillatory motion which induces a harmonic tangential force between two surfaces in contact. It is related to three main processes, i.e. fretting-wear, fretting-fatigue ...

    • 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 ...

    • Damage Prediction in Fatigue Corrosion Processes 

      Băicean, Svetlana; Palaghian, Liviu; Buciumeanu, Mihaela; Mereuță, Valentin (Universitatea ”Dunărea de Jos” din Galați, 2009)
      The paper aims to establish an algorithm for determining the values and evolution of the stress concentration factor in corrosive environment, and establish its influence on the fatigue strength of steel required in a ...

    • 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 ...

    • 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 ...

    • Durability of the Layers Deposed with Metal – Ceramic Powders Type CR3 C2 –NICR and High Speed Flame (HVOF) 

      Petrescu, Doina; Antonescu, Niculae Napoleon (UDJG, 2011)
      The durability of the reconditioned or preventively covered with powders type Cr3 C2 –NiCr product may outrun the performances of the original product and (the original specification, too). Due to the deposit of these ...

    • Durabilyty of Friction Pairs With Functionality in Abrasive Randomly Particles 

      Tudor, Andrei; Vlase, Monica (Universitatea "Dunărea de Jos" din Galaţi, 2007)
      It is shown that the abrasive particles, which penetrate in the convergent joint of friction pairs, can damage the superficial layer of surfaces. The wear caused by individual particle depends on having both a satisfactory ...

    • Dynamic Response of Ship Hull Composite Laminated Shells to Explosive Pressure 

      Chirica, Ionel; Boazu, Doina; Beznea, Elena-Felicia; Shenoi, R.Ajit (UDJG, 2010)
      The paper presents selected results of a study concerning the protective capacity of ship hull structures made of composite materials subjected to an explosion of a spherical charge. The main application of these structures ...

    • Dynamics of Hip Artificial Joints Wear 

      Căpitanu, Lucian; Iarovici, Aron; Onișoru, Justin; Țigăneșteanu, Constantin; Dima, Marius (Universitatea ”Dunărea de Jos” din Galați, 2008)
      In the present paper the authors try to evaluate, based on the results obtained from experimental and numerical previous studies, the wear evolution in the components of a Total Hip Prosthesis (THP), during the service ...

    • 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 ...